Technical field [0001] The present invention is an automobile, various vehicles other than automobile, general machinery, relates press molded article for use in a ship etc., in particular, the press-molded product having a bent portion, as well as methods and equipment columns for manufacturing the press-molded product on. Background technique [0002] 　Press-molded product having a bent portion, for example, automotive body skeletal member (eg cross member, side members, side sill, a pillar, etc.), and automotive various components (eg door impact beam, toe control link, suspension arm used to etc.). This press molded product can be obtained by bending by the press is subjected to the steel sheet which is a material. Recently, improvement in fuel consumption is required for the global environment, it is also obtained further improving the safety at the time of collision. Therefore, the press-thinning are promoted employing a high-strength steel sheet. However, the high strength of the material and its workability (particularly bending resistance) is inversely related. [0003] 　1A and 1B are a cross-sectional view showing an outline of a conventional general bending method. Of these figures, FIG. 1A shows the status of bending, Fig. 1B shows a press-formed product 2 manufactured through the bending shown in Figure 1A. In the conventional bending method, forming of the bent portion 5 press-molded article 2 is carried out by pressing one step. Specifically, as shown in FIG. 1A, bending a steel plate 1 with a punch 3 and die 4 is performed. Thus, as shown in FIG. 1B, the press molded article 2 having a bending portion 5 is molded. [0004] 　Generally, bending of the steel sheet 1 is evaluated by a limit R / t. Here, R is a minimum bending radius allows bending without cracking occurs, t is the plate thickness of the steel sheet 1. Recently, as the material of the skeletal member, the elongation is small tensile strength is begun to be used more than a high-strength steel sheet 980 MPa. Further, underbody parts (e.g. the suspension arm) as a material for the tensile strength are used the more high-strength steel sheet 590 MPa. In short, with the possible strength of the steel sheet 1 is increased, there is a tendency to limit R / t increases. Therefore, if you design a small bending radius of the bent portion 5 press-molded product 2, cracking the steel plate 1. On the other hand, when the large design bending radius of the bent portion 5 press-molded product 2, the rigidity of the frame members and suspension parts is reduced, the collision energy absorbing performance is lowered. Therefore, when producing a press-molded article 2 having a bent portion 5 from a high-strength steel sheet, a processing method that can reduce the limit R / t is strongly demanded. [0005] 　Figure 2A ~ 2C are cross-sectional views showing a summary of the disclosed bending method in JP 2010-172912 (Patent Document 1). Of these figures, FIG. 2A shows the status of one step th machining, Figure 2B shows the situation of the processing of the second step eyes. 2C shows a press-molded product 7, which is manufactured through the bending shown in FIGS. 2A and 2B. [0006] 　In the bending method Patent Document 1, forming the bent portion 8 of the press-molded product 7 is carried out by pressing which is divided into two steps. Specifically, as shown in FIG. 2A, the pressing of the first step first, bending the steel plate 6 using a punch 9 and the die 10 is subjected. Punch 9 and the die 10, the bending radius R of the bent portion 8 of the press-molded product 7 2 radius R bend greater than 1 gives the steel plate 6 the shape of. Thus, as shown in FIG. 2B, the bending radius R 1 intermediate product 12 having a bent portion 11 of is formed. [0007] 　In the press working of two steps first, as shown in FIG. 2B, processing is performed to the intermediate molded article 12 with the punch 13 and the die 14. Punch 13 and the die 14, the radius R bending the bending portion 8 of the press-molded product 7 2 gives a shape to the intermediate molded article 12. Accordingly, press-molded product 7 shown in FIG. 2C is molded. [0008] 　According to the bending method of Patent Document 1, in the press working of one step th bending radius R 1 is large, cracks are not generated. Further, in pressing the second step first, the tensile strain is reduced occurs on the outer surface of the bent portion 8, the occurrence of cracks can be suppressed. [0009] 　In Patent Document 1 bending method, the tip angle θ of the punch 13 used in the second step first 2 , the tip angle θ of the punch 9 for use in a single step th 1 is the same as. In other words, the inner angle of bending portion 8 of the press-molded product 7 is the same as the interior angle of the bending portion 11 of the intermediate molded article 12. CITATION Patent Literature [0010] Patent Document 1: JP 2010-172912 JP Summary of the Invention Problems that the Invention is to Solve [0011] 　Patent Document 1, the tensile strength with elongation of 59% and higher stainless steel plate at 889MPa, the case of producing a press-molded product having a bent portion, it is disclosed that can limit R / t 0. However, even by bending method of Patent Document 1, for example, if the higher elongation the tensile strength as high strength steel plate with a small metal plate, there is a possibility that cracking occurs at a bending portion. Therefore, it is required to reliably reduce the limit R / t. [0012] 　One object of the present invention, small bend has a radius of bend, tensile strength even more press-molded product 590 MPa, tensile strain is small cracks of the outer surface of the bent portion is suppressed it is to provide a press-molded product. Another object of the present invention is to provide a manufacturing method and manufacturing equipment train can be manufactured such press-formed product. Means for Solving the Problems [0013] 　Press-molded product according to an embodiment of the present invention, the tensile strength is from the above metal plate 590 MPa, comprising a pair of flat portions, and a bent portion connecting the pair of flat portions, the. In this press-in section, the thickness increases with increasing distance from near the top of the bent portions, further, to increase again after the plate thickness is reduced with increasing distance from the vicinity of the end of the bending portion, further, the bend portion position thickness in beyond than 1.5 times away position of the original plate thickness from the end of the original sheet thickness. [0014] 　In the above press-average t of the plate thickness at the position of the end of the bent portion to the original plate 1.5 times away position in the thickness 2 and the plate thickness t at the top of the bend 1 and , the ratio "t 2 / t 1 " is less than 1.01, it is preferable. [0015] 　The above press-molded article, a top plate portion, if provided with two longitudinal wall portions, and a ridge portion connecting each of said vertical wall portion and the top plate, the top plate portion and the vertical wall portion is the thereby constituting a flat portion, said ridge portion constitutes the bending portion, it is preferable. [0016] 　The above press-molded article, the top plate portion, and two longitudinal wall portions, and the top plate portion and the upper edge line portion connecting the respective vertical walls, and two flange portions, and each of the longitudinal walls each If having a lower ridge portion connecting the flange portion, together with the top plate portion and the vertical wall portion constituting the flat portion, or the upper ridge portion constitutes the bending portion, and / or, wherein with vertical wall portion and the flange portion constituting the flat portion, the lower ridge portion constitutes the bending portion, it is preferable. [0017] 　The above press-molded product had a tensile strength has the above described steel plate 1180 MPa, it is preferable. The tensile strength may be greater than or equal to 780MPa, may be greater than or equal to 980MPa. [0018] 　Method for producing a press-molded product according to an embodiment of the present invention includes a pair of flat portions, and a bent portion connecting the pair of flat portions, and the bent portion of the bending radius R 2 of the pair flat eggplant interior angle parts are theta 2 is a method for producing a press-molded product is. The manufacturing method includes the material preparation step, a first forming step, a second molding step. The material preparation step, the tensile strength is prepared the above metal plate 590 MPa. In the first molding step, subjected to press working to the metal plate by using a mold, the press-molded product wherein the bend radius bending in a portion corresponding to of R 1 (mm) interior angle θ with 1 of (°) In the second molding step, subjected to press working to the intermediate molded article by using a mold, the intermediate molded article wherein the bent portion bending radius of R 2 (mm) internal angle in the theta 2 bending (°) Then, the intermediate molded article wherein the bending radius R of 1 and the inner angle theta 1 , and the press said molded article bending radius R 2 and the internal angle theta 2 is, satisfies the condition of the following formula (1) to (3) to. 　1.05