0001]The present invention is a hot stamp moldings, automotive members, and a method of manufacturing a hot stamping molded article. 　Priority is claimed based on July 13, 2016 2016-138962 Patent Application No. filed in Japan, and Japanese Patent Application No. 2017-077432 filed in Japan on April 10, 2017, which which is incorporated by reference in the content here. BACKGROUND [0002]Structural members of vehicles (especially motor vehicles elongated member), the order to improve the collision safety performance are required to be characteristic in the three-point bending test is high. Response to this request, various proposals have been made in the past. [0003] 　For example, Patent Document 1, for the purpose of increasing the bending crush properties, discloses a shock absorbing member and a manufacturing method thereof comprising a portion of the steel sheet is folded in triplicate. Patent Document 2, for the purpose of increasing the axial crush properties, discloses a shock absorbing member and a manufacturing method thereof comprising a portion of the steel sheet is folded in triplicate. [0004] 　Further, Patent Document 3 discloses a predominantly bend for the purpose of increasing the rigidity, the frame parts and a manufacturing method thereof reinforcing portion formed at a connection portion between the top wall and the vertical wall portion. Then, the reinforcing portion is comprised of a superposition unit rounded into a cylindrical shape. CITATION Patent Document [0005] Patent Document 1: Japanese Patent 2008-265609 JP Patent Document 2: Japanese Patent 2008-155749 JP Patent Document 3: Japanese Patent 2013-27894 JP Summary of the Invention Problems that the Invention is to Solve [0006] 　Recently, structural members of a motor vehicle (hereinafter, also referred to as automobile parts), the order of such weight reduction of automobiles, high-strength (high tensile strength) is required. Then, in the automobile member, high tensile strength steel sheet (hereinafter, also referred to as "high-tensile steel plate (high-tensile steel)") is used. In addition, the automobile members are also required to improve the collision safety performance. In other words these, high strength and characteristics in three-point bending test is high press-molded product is required. 　On the other hand, high-tensile steel plate is generally to ductility is lowered, molding failure is likely to occur, such as cracks during press working. [0007] 　High-tensile steel plate using the method disclosed in Patent Documents 1 to 3 (e.g., tensile strength over the steel sheet 780 MPa) when pressing a, is a possibility that the deformation molding defects such as cracks occur in large overlapping portion is there. Therefore, the disclosed in Patent Documents 1 to 3 method, high tensile strength and it is difficult to properties in three-point bending test to produce a high press-molded product. [0008] 　The present invention has been made in view of the above circumstances, tensile strength and high three-point bending properties can be improved hot stamping molded products in the test, an automobile member, and a manufacturing method of a hot stamping molded article and an object thereof is to provide a. Means for Solving the Problems [0009] 　In order to solve the above problems, the present invention employs the following. (1) hot stamping molded article according to the first aspect of the present invention, there is provided a hot stamp molded article made from a single steel plate, a top plate portion; wherein said top plate portion; and a pair of vertical wall portions and connects the vertical wall portion, a protrusion protruding toward the outside of the top plate portion; wherein the protrusions and the inner wall portion rising from the top plate portion, from the edge of the inner wall portion and a outer wall folded outward portion, the angle between the top plate portion and the protrusion forms is 80 ° ~ 90 °. (2) In the aspect described in (1) above, wherein the inner wall and the outer wall of the protruding portion may be in contact with each other. (3) In the aspect described in the above (1), said inner wall and said outer wall portion of the protrusion may be joined together. (4) In the aspect described in any one of the above (1) to (3), the projecting length of the protrusions may be 3mm or more. In the aspect described in any one of (5) above (1) to (4), and is connected to an end of the pair of vertical wall portions, a pair of flange portions extending so as to separate from each other it may be provided further. [0010] (6) Automobile member according to the second aspect of the present invention, the above (1) to (5) and one hot stamping molded article according to one of; so as to constitute the hot stamp molded article and closed section comprises; the hot stamping molded article bonded steel sheet member. In the aspect described in (7) above (6), the inner surface of the top plate portion, and may further include a patch member bonded to at least one of the inner surface of the vertical wall portion. [0011] (8) third manufacturing method of hot stamping molded article according to the aspect of the present invention is a method for producing a hot stamp molded article according to any one of the above (1) to (5), material steel presses the, a preparation step to obtain a preform having a recess formed; a heating step of heating the preform; with a heated said preform by pressing, the said preform a press forming step of forming a hot stamp molded article; has, in the press molding step, the lower mold having a convex portion, and having a punch portion for pressing the preform, the vertical towards the lower die an upper die movable in the direction, and in between the protrusions, using a pressing device having a pair of slide type movable horizontally toward the side surface of the convex portion, the preform and the convex portion of the lower mold is the preliminary And projects into the recess of the molded article, the convex portion, the punch unit, and so as to be non-contact with the pair of the slide, placed on the press apparatus, the punch portion and the pair the slide die is moved to press said preform. (9) In the aspect described in the above (8), may be configured as follows: the upper die of the press device is arranged so as to face to said slide and said slide-type has a slide press die to press further, in the press molding process, by the slide pressing mold is moved toward the lower die, while the slide die is in contact the sliding press die sliding, the preform to press. In the aspect described in (10) above (8) or (9), after the pressing by the punch portion is completed, the pressing by the slide die may be completed. [0012] (11) Fourth production method of a hot stamping molded article according to the aspect of the present invention, the convex portion, and, and in between the protrusions, the lower mold having a pair of movable plate being movable in a vertical direction When a press device comprising a punch-type movable vertically toward the protrusions, and in between said punch form, and said movable plate and a pair of mobile movable toward the convex portion with, a method for producing a hot stamp molded article according to (5), heating the steel sheet; the heated the steel sheet, so that non-contact with the convex portion, and the pair of the mobile is lowered while being contact with the steel sheet, the steel sheet, process and molded into deformation steel sheet having a recess; said pair of the step of placing the movable plate the punch type It is moved toward the convex portion, A step of pressing the serial deformed steel sheet; having; a pair of mobile is moved toward the punch type, a step of pressing the deformed steel sheet. Effect of the invention [0013] 　According to the above aspect of the present invention, tensile strength and high three-point bending characteristics in the test can be improved hot stamping molded products, automobile parts, and to provide a method of manufacturing a hot stamp moldings it can. BRIEF DESCRIPTION OF THE DRAWINGS [0014] It is a perspective view showing FIG. 1 press-molded product according to the first embodiment of the present invention (hot stamp molding). [2] a diagram showing the press-formed product is a cross-sectional view when viewed in cross section perpendicular to the longitudinal direction (transverse sectional view). [FIG 3A] is a perspective view showing a first modification of the press-molded article. [FIG 3B] is a perspective view showing a second modification of the press-molded article. [Figure 4] A diagram showing a third modification of the press-molded product is a partial cross-sectional view when viewed in a cross section perpendicular to the longitudinal direction. [Figure 5A] A diagram showing an automobile member with the press-molded product is a cross-sectional view when viewed in cross section perpendicular to the longitudinal direction (transverse sectional view). [FIG. 5B] is a cross-sectional view showing a first modification of the automobile member. [FIG. 5C] is a cross-sectional view showing a second modification of the automobile member. 6 is a cross-sectional view showing an example of a preform used in the manufacture of the press-molded product. [Figure 7A] A cross-sectional view showing a press apparatus for producing the press molded product is a view showing a state where the end portion is placed preforms bent downward. [Figure 7B] A cross-sectional view showing a continuation of the manufacturing method according to the press apparatus is a diagram showing a state in which bound a portion of the preform between the upper and lower molds. [FIG. 7C] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG. 7D] is a cross-sectional view illustrating a continuation of the manufacturing method according to the press apparatus. 8 is a cross-sectional view showing a modification of the pressing device. It is a transverse sectional view showing a press apparatus used in the method of manufacturing a press molded article according to the second embodiment of FIG. 9A] present invention. [FIG. 9B] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG 9C] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG 9D] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG 9E] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. It is a transverse sectional view showing a press apparatus used in the method of manufacturing a press molded article according to the third embodiment of FIG. 10A] present invention. [FIG. 10B] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG. 10C] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG. 10D] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG 10E] is a cross-sectional view showing a continuation of the manufacturing method according to the press apparatus. [FIG. 11A] is a cross-sectional view showing a sample 1 used in Example. [FIG. 11B] is a cross-sectional view showing a sample 2 used in Example. [FIG. 11C] is a cross-sectional view showing a sample 3 used in Example. 12 is a diagram for explaining the three-point bending test. [FIG. 13A] is a graph showing an example of the energy absorption amount of each sample. [FIG. 13B] is a graph showing another example of the energy absorbing amount of each sample. [14] in the three-point bending test, a cross-sectional view showing an example of the shape change of the sample 1. In [15] a three-point bending test, a cross-sectional view showing an example of the shape change of the sample 3. [FIG. 16A] is a cross section showing a third modification of the automobile member. [FIG. 16B] is a cross section showing a fourth modification of the automobile member. [FIG. 17A] is a cross-sectional view showing a fifth modification of the press-molded article. [FIG. 17B] is a cross-sectional view showing a sixth modification of the press-molded article. DESCRIPTION OF THE INVENTION [0015] 　Hereinafter, with reference to the drawings, the embodiments and the modifications of the present invention will be described in detail. Incidentally, omitted in the present specification and drawings, are denoted by the same reference numerals to constituent elements having substantially the same functional configurations, and their redundant description. [0016] 　(First Embodiment) [hot stamping molded article (press molding)] 　will be described first hot stamping molded article according to the first embodiment of the present invention. In the following description, the hot stamp molded products sometimes referred to as a "press-molded product." Further, referred to herein, the pair of vertical wall portions, a virtual surface connecting the end portions of the pair of vertical wall portions, a region surrounded by the top plate portion and the "inside of the press-molded product", vertical walls across the part and the top plate portion and the inner may be referred to a region on the side opposite the "outside of the press-molded product". 　Figures 1 and 2 are views showing a press-molded product 100 (hot stamp molding) according to the first embodiment of the present invention. Incidentally, FIG. 1 is a perspective view, FIG. 2 is a sectional view when viewed in cross section perpendicular to the longitudinal direction (transverse sectional view). In the following, referred to as upper (top plate side) above the press-molded product 100 (outside) in FIG. 2, may be referred to as downward (flange side) of the press-molded product 100 downward (inward) in FIG. 2 . [0017] 　Press-molded product 100 is made from a single steel plate 101 long in one direction, it is manufactured from a single steel plate (blank) by hot stamping. Tensile strength of the press-molded product 100 is, for example, at 590MPa or more, may be more than 780 MPa may be more than 980 MPa may be more than 1500 MPa, may be more than 1800 MPa. The upper limit of the tensile strength of the press-molded product 100 is not particularly limited, but for example 2500MPa or less. Since the use of hot stamping in the production of the press-molded product 100, the tensile strength of the press-molded product 100 can be higher than the tensile strength of the steel sheet is a material. 　Here, the steel sheet (blank), a flat plate-like steel plate and has a flat shape corresponding to the shape of the press-molded product to be produced. The thickness and properties of the steel plate is selected according to the characteristics required for the press-molded product 100. For example, if the press-molded product 100 is used in the structural member of the vehicle (automobile parts), steel plate is selected accordingly. The thickness of the steel plate may be, for example, 0.4 mm ~ 4.0 mm, may be a 0.8 mm ~ 2.0 mm. [0018] 　Press-molded product 100, structural members of various moving means (automobile, motorcycle, railway vehicles, ships or aircraft, etc.,), or can be used for structural members of various machines. The structural member of an automobile, for example, can be exemplified side sill, a pillar (front pillar, front pillar lower, center pillar, etc.), a roof rail, a roof arch, a bumper, a belt line reinforcement, and a door impact beam. [0019] 　As shown in FIGS. 1 and 2, the press-molded product 100 includes a top plate portion 112, a pair of vertical wall portions 111 parallel to each other, connected to the top plate portion 112 and a pair of vertical wall portions 111 and includes a pair of projecting portions 115 projecting upward (outward) of the top plate 112, the pair of vertical wall portions 111 and a pair of flange portions 113 which are connected so as to be separated from each other there. 　Each vertical wall portion 111, top plate 112, and the flange portions 113 are tabular. The top plate 112, and is perpendicular to the pair of vertical wall portions 111 are connected to each other a pair of vertical wall portions 111 through a pair of protrusions 115. Incidentally, as shown in FIG. 2, the flange portion 113, the lower end of the vertical wall portion 111 and extends toward the and outside in the width direction perpendicular to the vertical wall portion 111. That is, the flange portion 113, and an outer-facing flange is parallel to the top plate portion 112. [0020] 　A pair of projections 115, when viewed in cross section perpendicular to the longitudinal direction, these cross-sectional shape is a line symmetry with each other. Protrusions 115, from the boundary portion 114 connecting the vertical wall portion 111 and the top plate 112 (surface and intersect position including the face and the top portion 112 including a vertical wall portion 111) with respect to the top plate portion 112 and vertically Te and protrudes upward. Protrusions 115 (a pair of surfaces facing each other in the thickness direction of the top plate 112, a surface facing the outside) outer surface 112s of the top plate 112 and the inner wall portion 101a which rises continuously from the inner wall from 101a of the tip 115t (edge) is folded on the outside of the inner wall portion 101a (the outside in the width direction of the press-formed article 100) and a connected outer wall portion 101b to the vertical wall portion 111. That is, the projecting portion 115 has a double wall structure. [0021] 　The protruding portion 115, and the inner surface of the outer surface and the outer wall portion 101b of the inner wall portion 101a is in contact with one another. That is, by the inner wall portion 101a and the outer wall portion 101b abuts, they are superposed, the superposition portion 115d is formed. 　Incidentally, superposed section 115d as a whole are tabular. Also, cross section (cross section perpendicular to the longitudinal direction) of the press-molded product 100 excluding the protruding portion 115 is a hat-shaped. [0022] 　Here, with respect to the Vickers hardness WHV the vertical wall portion 111, the ratio of the Vickers hardness MHv of the protrusion 115 (MHv / WHV) may become 0.95 or more. [0023] 　As shown in FIG. 2, the angle formed by the top plate portion 112 and the projecting portion 115, the angle X (°). Specifically, the angle X refers to a plane including the outer surface 112s of the top plate 112, the angle formed by the plane including the (inner surface of the inner wall portion 101a at the overlapping portions 115d) surface 115ds of the overlapping portion 115d . As shown in FIG. 2, the press-molded product 100, composition unit 115d and is perpendicular to the top plate portion 112, the angle X is 90 °. Angle X may be any 80 ° ~ 90 °, and more preferably 85 ° ~ 90 °. 　In the case a part of the top plate 112 by such minute irregularities on the top plate portion 112 is formed is not flat, the angle when considered as flat as a whole top plate portion 112, the angle of the top plate portion X and it should be. [0024] 　Between the outer wall portion 101b and the vertical wall portion 111 extending from the vertical wall portion 111, not the stepped portion or curved portion, etc. is provided, and the outer wall portion 101b and the vertical wall portion 111 constitutes a single flat plate It is continuous so. This can prevent the load is concentrated on the stepped portion or the curved portion at the time of collision. [0025] 　(Distance from the inner surface of the top plate 112 to the tip 115t of the projecting portion 115: see FIG. 11A) protruding length D of the projecting portion 115 may also be 3mm or more, 5 mm or more, there at 10mm or more, or 15mm or more it may be. The upper limit of the protrusion length D is not particularly limited, is, for example 25mm or less. 　A pair of protrusions 115, these projecting lengths D are equal to each other. Incidentally, the protrusion length D of the pair of projecting portions 115 may be different from each other, in this case, the difference therebetween is preferably within 10% of the longer protrusion length D of the protruding portion of the. 　The length of the overlapping portion 115d (distance from the bottom of the overlapping portion 115d to tip 115t) is less than 1 times the protrusion length D, for example, from 0.1 to 1 times the projection length D. Note that the length of the overlapping portion 115 d, even 0.5 to 1 times the protrusion length D, may be 0.3 to 0.8 times. [0026] 　As shown in FIG. 2, the superposition unit 115d is not rounded in a cylindrical shape. That is, the cross-sectional shape of the overlapping portion 115 d (shape when viewed in cross section perpendicular to the longitudinal direction) is linear. Further, the overlapping portions 115 d, as described above, the inner wall 101a and outer wall 101b is in contact with one another. Further, in a region other than the tip 115t, part of the steel plate which constitutes the projecting portion 115 is not bent but is curved. That is, except for the tip 115t, the projecting portion 115, there is no ridge portion protruding toward the outside of the projecting portion 115. [0027] 　As shown in FIG. 2, inside of the press-molded product 100, the angle between the vertical wall portion 111 and the top portion 112 and Y (°). Then, the press-molded product 100, the angle Y is 90 °. The angle Y may be less than 90 °, it may be 90 ° ~ 150 °. Also, while the angle formed Y of the top plate 112 and the pair of vertical wall portions 111, and the angle Y formed by the top plate portion 112 and the other vertical wall portion 111, the difference therebetween is within 10 ° it is more preferably preferably, identical. [0028] 　As shown in FIG. 2, the press-molded product 100, a vertical wall portion 111 and the flange portion 113 are continuous through the R portion 116 having a predetermined radius of curvature. Thus, it is possible to suppress the buckling generated load is concentrated on the boundary between the vertical wall portion 111 and the flange portion 113. [0029] 　Similarly, the top plate portion 112 and the protrusion 115 is continuous through the R portion. Thus, it is possible to suppress the buckling is generated to concentrate the load on the boundary between the top plate portion 112 and the protrusion 115. The curvature radius of the R portion is preferably 0.1 to 1 times the protrusion length D, more preferably 0.2 to 0.8 times the protrusion length D, 0.2 ~ of protrusion length D more preferably 0.5 times. [0030] 　Incidentally, the projecting portion 115 only in a partial region in the longitudinal direction is formed, it may not be protruded portion 115 is formed in the other regions (i.e., protrusions across the longitudinal direction of the press-molded product 100 115 There is not formed, it may be protruded portion 115 is formed only on a part of the length of the press-molded product 100). 　A perspective view of an example press-formed product 100 which protrusions only a portion of the longitudinal direction are formed is shown in Figure 3A. In the press-formed product 100 of Figure 3A, no protruding portion 115 is formed in a region P2 in the longitudinal ends, protruding portions 115 are formed in the longitudinal center of the region P1. With this configuration, it is possible in the case of a structural member of the press-molded product 100 in combination with other members, the other members without being restricted by the shape and obtain the desired collision safety performance. 　Here, as shown in FIG. 3A, the press molded article protrusions only a portion of the longitudinal direction is formed, be manufactured by a manufacturing method according to this embodiment described below (production method by the two-step) be one, it can not be produced by the production method according to the second embodiment (manufacturing method according to one step). However, the longitudinal ends of the press-molded product protruding portion 115 over the entire longitudinal direction are formed, by bonding such as by welding the other of the press-molded product having no protrusions, FIG. 3A or FIG. 3B can be produced press-molded product as shown (i.e., a press-molded product manufactured by the manufacturing method according to the second embodiment, if joined to the other of the press-molded product having no protrusions, Figure 3A or it can be produced press-molded product as shown in FIG. 3B). [0031] 　Also, a perspective view of another example of the press-molded product 100 the protrusion only a portion of the longitudinal direction are formed in Figure 3B. Press-molded product 100 of FIG. 3B is an example of a center pillar. Incidentally, FIG. 3B is an example of a case of using a press-molded product 100 to the center pillar, it shows an outer edge of the projecting portion 115 with a thick line. [0032] 　Further, as shown in FIG. 4, the inner wall portion 101a and the outer wall 101b constituting the protruding portion 115 may be joined together by welding. That is, in the area A corresponding to the overlapping portions 115 d, and the inner wall portion 101a and the outer wall portion 101b may be joined by welding such as spot welding or laser welding. Further, in the area B except for the superposed section 115 d, it may be the inner wall portion 101a and the outer wall 101b joined by arc welding (fillet welding). [0033] 　Incidentally, the inner wall portion 101a and outer wall 101b constituting the projecting portion 115 is not limited to welding, for example, adhesives, brazing, riveting, bolting or may be joined by such friction stir welding. [0034] 　According to the press-molded product 100 according to the present embodiment described above, because it connects the top plate portion 112 and the vertical wall portion 111 via the projecting portion 115 of the double wall, the rigidity of the press-molded product It can be improved. Therefore, it is possible to the time of the load to generate a three-point bending deformation is inputted to the press-molded product 100, the deformation of the press-molded product 100 reduced. That is, in the three-point bending test, it is possible to suppress the seat屈発production of the vertical wall portion 111, thereby improving the characteristics of the three-point bending test (energy absorption amount with respect to three-point bending deformation). As described later, the tensile strength is in the press-molded product 100 of high strength having the above steel sheet 590MPa by hot stamping. Accordingly, the tensile strength is high press-molded product 100 can improve the characteristics in three-point bending test. 　As described above, it is preferable that the inner wall portion 101a and the outer wall portion 101b of the projecting portion 115 is joined. In this case, it is possible to prevent in the load is applied to the press-molded product 100, separation of the inner wall portion 101a and the outer wall portion 101b (the inner wall portion 101a and the outer wall portion 101b and are spaced from each other deformation). That is, while the rigidity is high protrusions 115, the press-molded product 100 since receiving the load, can be further suppress deformation of the press-molded product 100 can be further improved properties in three-point bending test. [0035] [Automobile members] 　FIG 5A is a cross-sectional view illustrating a mobile member 200a according to the first embodiment of the present invention. Automotive member 200a is and long in one direction, the cross section perpendicular to the longitudinal direction is hollow, from a press-molded product 100 and back plate 201 (steel member) constituted. Automotive member 200a is, for example, the side sill, a pillar (front pillar, lower front pillar, center pillar, etc.), roof rail, a roof arch, bumper, belt line reinforcement or door impact beams,. [0036] 　As shown in FIG. 5A, automobile structural member 200a is provided with a press-molded product 100, and a pair of flange portions 113 flat backing plate 201 which is joined to the press-molded product 100 (steel member). The press-molded product 100 and backplate 201, for example, are joined together by welding, such as resistance spot welding or laser welding. The bonding method of the press molded article 100 and back plate 201 is not limited to welding, for example, adhesives, brazing, riveting, bolting, or may be a friction stir welding. [0037] 　Figure 5B is a cross-sectional view showing a first modification of the motor vehicle structural member 200a, a diagram illustrating a motor vehicle structural member 200b. As shown in FIG. 5B, a press-molded product 100, which is joined to a pair of flange portions 113 of the press-molded product 100, as an automotive structural member 200b having a cross-sectional hat-shaped back plate 202 having a pair of flange portions 202a it may be. [0038] 　Figure 5C is a cross-sectional view showing a second modification of the motor vehicle structural member 200a. As shown in FIG. 5C, a pair of the press-molded product 100 may be an automobile structural member 200c formed by joining like the flanges 113 face each other. Incidentally, an automobile structural member 200c is to the height of the pair of the press-molded product 100 may be different from each other, it may be identical. [0039] 　Hot stamping method for manufacturing a molded article] 　A method of manufacturing a hot stamping molded article according to the present embodiment (hereinafter, also referred to as "production method of the press-molded product") will be described. Method for manufacturing a press molded article according to the present embodiment is a method for obtaining a press-molded product 100 by pressing a single steel sheet (hot stamping molding), the preparing a preform 301 It has a first step, a second step of forming the press-molded product 100 to preform 301 by hot stamping (hot press). Because heated steel sheet is high ductility, by performing the second step in hot stamping, in molding a high tensile strength steel plate for press molding article 100, it is possible to suppress molding defects occurrence of cracks it is possible, it is possible to increase the tensile strength by quenching after pressing. [0040] 　Figure 6 is a transverse sectional view showing an example of a preform for use in the production of the press-molded product. First, in a first step, for example, tensile strength by pressing a single steel sheet of more than 590MPa cold by plastic deformation, shown in FIG. 6, the preform for producing a press-molded product 100 give 301 (deformed steel). As shown in FIG. 6, since the preform 301 is plastically deformed, the shape is maintained in a state where no load is applied. From the viewpoint of producing a higher-tensile strength press-tensile strength of the material steel sheet, more preferably at least 780 MPa, preferably is preferably at least 980 MPa, at least 1200 MPa, 1500 MPa by more preferably more, further preferably at least 1800 MPa. The tensile strength of the upper limit is not particularly limited in the steel sheet, but for example 2500MPa or less. 　Further, the deformation of the steel sheet to preform 301, usually, it is possible to perform in cold working since not so large (cold press), if necessary, hot working (for example, hot pressing it may be carried out in). [0041] 　Note that the chemical composition of the steel sheet to ensure desired strength in hot stamping, C content: 0.090 to 0.400 mass%, Mn: 1.00 ~ 5.00 wt%, B: 0.00050 preferably in the ~ 0.05000 wt%. As the typical chemical composition of the steel sheet to a tensile strength after quenching and above 1500 MPa, C: 0.200 wt%, Si: 0.0200 wt%, Mn: 1.30 wt%, al: 0.030 wt%, Ti: 0.02 mass%, B: the exemplified 0.00150 wt%. [0042] 　As shown in FIG. 6, the preform 301 in cross section is hat-shaped, and U-shaped portion 301a, the flat portion 301b corresponding to the pair of flange portions 113 of the press-molded product 100 (the flange portion corresponding to portion) having. Then, the preform 301, the U-shaped portion 301a, (the space in the U-shaped portion 301a) recesses 302 are formed. 　U-shaped portion 301a includes a pair of vertical wall corresponding part 301aw corresponding to the pair of vertical wall portions 111 of the press-molded product 100, a top plate corresponding part 301at corresponding to the top plate portion 112 of the press-molded product 100 , and a protruding portion corresponding portion 301ae corresponding to the protrusion 115 of the press-molded product 100. In the preform 301, the pair of vertical wall corresponding part 301aw is bent in the same direction with respect to the top plate corresponding part 301At. In other words, the pair of vertical wall corresponding part 301aw is bent on one main surface of the top plate corresponding part 301At. 　Incidentally, the preform 301 is not limited only to the pressing process may be molded by deforming a steel sheet by other methods. [0043] 　Here, the length of the U-shaped portion 301a (the section length) and Lu. Furthermore, the press-molded product 100, the height of the vertical wall portion and Hb (corresponding to Hb1 in Figure 11A), the width between the two vertical wall portions and Wb (corresponding to Wb1 of Figure 11A). U-shaped portion 301a, in addition to the vertical wall corresponding part 301aw and the top plate corresponding part 301At, having protrusions corresponding portions 301ae that the projecting portion 115 by the process described below. Therefore, the length Lu, width Wb, and height Hb satisfy the relation Wb + 2Hb