Next, as a second embodiment, the a press working apparatus 10 according to the first embodiment, by using the press working apparatus 10 'according to the second embodiment, the first punch and second punch and operation timing of the investigated the relationship between the sheet thickness reduction rate and curvature. [0062] 　[Analysis conditions] 　the blank, of Table 1 of Example 1, the tensile strength using steel sheet 590 MPa. The thickness of the steel plate were the same 0.8mm as in Example 1. 　Further, the die of the die and different dimensions used in Example 1 was one prepared. Specifically, the depth d1 is 30 mm, the depth d2 is prepared 60mm die. 　Then, in each of the press working apparatus 10 and the press working apparatus 10 ', the second position of the first punch 12 at the time the punch 13 is poked bottom (when the second punch 13 has reached the bottom dead center) (Die 15 distance from the reference surface 16C to the front end surface 12A of the first punch 12 p1: under conditions of varying see FIG. 3B and FIG. 5C), was prepared the door inner panel 1. 　These other analysis conditions are the same as the analysis conditions of Example 1. [0063] 　[Evaluation Method] 　Using the above equation (1), was investigated thick plate reduction index of the top plate portion. From this distribution, the maximum value of the sheet thickness reduction rate of the top plate portion. This will not, be the same as the evaluation method of Example 1. [0064] 　[Analysis Result] 　shows the analysis results in FIG. 6, the horizontal axis represents the ratio p1 / d1 of p1 for d1, the vertical axis represents the absolute value of the sheet thickness reduction rate (%) and curvature (1 / mm). Incidentally, the plate thickness reduction rate (%) is the maximum value of the sheet thickness reduction rate of the top plate portion. 　Here, p1 / d1 is less than one plot shows the results obtained with the press working apparatus 10. The plot of p1 / d1 = 1, when the pushing of the second punch 13 is completed, the height position of the distal end surface 12A of the first punch 12, and the height position of the distal end surface 13A of the second punch 13 There is a result of the case of producing a door inner panel in identical is condition (see FIG. 3B). The condition p1 / d1 <1 plot, when the second punch 13 is poked bottom height position of the distal end surface 12A of the first punch 12 is located between the reference surface 16C and the stepped surface 16B of the die 15 is a (0 1 shows the results obtained with the press working apparatus 10 '. As described above, in this embodiment, since the depth d1 is 30 mm, the depth d2 was used 60mm die, plot of p1 / d1 = 2, the first punch 12 and second punch 13 If push is completed at the same time, i.e., it corresponds to case produced using the conventional press working apparatus 200 (see FIG. 4). [0065] 　As shown in FIG. 6, the boundary of p1 / d1 = 1, as the p1 / d1 is large, the curvature is increased. From this result, towards the stamping device 10 (first embodiment), as compared with the pressing device 10 '(second embodiment), it was confirmed that the occurrence of wrinkles can be suppressed. 　On the other hand, the boundary of p1 / d1 = 1, as the p1 / d1 is large, the thickness reduction rate of the top plate is reduced. From this result, towards the stamping device 10 '(second embodiment), as compared with the pressing device 10 (first embodiment), it was confirmed that the cracking of the top plate portion can be suppressed. 　Furthermore, in the case of 1.1 ≦ p1 / d1 ≦ 1.7, thickness reduction ratio and 15% or less, the curvature is 0.01 mm -1 becomes less. That is, by setting p1 / d1 in the range, cracking of the top plate portion, and was found to be suppressed both wrinkles of the stepped portion. [0066] 　Having described the embodiments of the present invention, these embodiments have been presented by way of example, the scope of the present invention is not limited only to these embodiments. These embodiments described herein may be embodied in other various forms, without departing from the spirit of the invention, various omissions, substitutions, and changes can be made. Such embodiments and modifications as would fall within the scope and spirit of the invention, and are included in the invention and the scope of their equivalents are claimed. [0067] 　For example, in the first embodiment, four adjacent vertical wall section 4 (3 sets of vertical wall portion 4) showed a case having a step portion 5. However, as shown in FIG. 7, three adjacent vertical wall section 4 (two pairs of vertical wall portion 4) may be a door inner panel having a stepped portion 5. [0068] 　Further, for example, in the above-described first embodiment, one of the first punch 12, by pressing device 10 and a one second punch 13 has been described a case of manufacturing the door inner panel 1. However, for example, the second punch 13, may be divided into a plurality. That may be used and one of the first punch, a press working apparatus having two second punch. [0069] 　Further, for example, in the above-described first embodiment, the press working apparatus 10, which has a punch 11 and the blank holder 14 upward, showing the case where a die 15 downward. However, the punch 11 and the blank holder 14 may be vertically inverted arrangement of the die 15. That is, the press working apparatus 10, the punch 11 and the blank holder 14 may be configured to move relative to the die 15. [0070] 　Further, for example, in the above-described first embodiment, the top plate portion 2 of the door inner panel 1, showing a case having one opening 3. However, the top plate portion 2 of the door inner panel 1 may have a plurality of openings 3. [0071] 　Further, for example, the case of using the steel plate as the blank material S used in the manufacturing method according to the above embodiments, the steel sheet may be tailored blanks. Tailored blank is tailored welded blanks (hereinafter, also referred to as "TWB") and, tailored rolled blanks (hereinafter, also referred to as "TRB") are classified into. TWB is obtained by integrating thickness, by welding the tensile strength and the like different kinds of steel sheets (e.g., butt welding). Meanwhile, TRB by changing the distance between the rolling rolls when producing the steel sheet, in which varying thickness. With this tailored blank, it is possible to place only the high strength required, it is also possible to reduce the plate thickness. Further, the panel-like molded article using a tailored blank can be applied to the door inner panel for an automobile. Thus, it is possible to improve the crashworthiness of the door inner panel, further views of the lighter. [0072] 　In the above embodiments showed the case of producing the automotive door inner panel as a panel-shaped molded article. However, not limited only to the above applications, for example, can be used in a vehicle, construction machine or aircraft or the like. DESCRIPTION OF SYMBOLS [0073] 1: a door inner panel (panel-shaped molded article) 2: top plate 3: opening 4: vertical wall portion 4A: top plate portion side vertical wall 4B: flange portion side vertical wall 5: the stepped portion 6: flange 10: stamping device 12: first punch 13: the second punch 14: blank holder 15: die BL: beltline S: blank The scope of the claims [Requested item 1] 　A top plate portion of the polygon, and the vertical wall portion extending from the at least two adjacent sides of the sides of the top plate portion, of the vertical wall portion, adjacent the vertical wall portion set of at least one pair of a method of manufacturing a panel-shaped molded article having a stepped portion provided on each longitudinal wall, 　preparation step of preparing a blank tensile strength is from the metal plate 980MPa or 390MPa and; 　the cold subjected to press working the blank, the blank and a press forming step of forming the panel-shaped molded product; has, 　in the press molding process, 　a mold engraved portion shape of the panel-shaped molded article is shaped a die having, 　and to face the die, a first punch having a tip surface shape of the top plate portion is shaped, 　together with facing the adjacent and the die to the outside of the first punch, the shape of the step portion is shaped A second punch having an end face, 　and adjacent to at least a portion of an outer side of the second punch, a blank holder which faces the die using a press working apparatus having, 　and the die, the blank holder, wherein the blank is disposed between the first punch and the second punch relative to the die, the blank holder, the first punch, and the second punch relatively moved, the blank said first punch and push the second punch, 　the push to the blank by the second punch is completed earlier than the pushing to the blank by the first punch panel-shaped molded article, characterized in that the method of production. [Requested item 2] 　Wherein the press molding step, pushing into the blank by the second punch when completed or after the pushing is completed, push to the blank by the first punch begins claim 1, characterized in that panel-shaped molded article manufacturing method according to. [Requested item 3] 　In the press molding step, before pushing to the blank by the second punch is completed, push to the blank by the first punch begins panel-like molding according to claim 1, characterized in that method of manufacturing the goods. [Requested item 4] 　Wherein said mold engraved portion of the die of the press working apparatus, 　wherein a depth from the blank holder facing the reference surface to the step surface facing the second punch and d1 (mm), the first from the reference plane when the depth to mold bottom punch facing was d2 (mm), d2 ≧ 40 , and satisfies d1 / d2 <0.8 any one of claims 1 to 3, wherein the panel-shaped molded article manufacturing method according to. [Requested item 5] 　The blank material is a steel panel-shaped molded article manufacturing method according to any one of claims 1 to 4, characterized in that. [Requested item 6] 　The steel sheet is a tailored blank panel-shaped molded article manufacturing method according to claim 5, characterized in that. [Requested item 7] 　The blank has an opening at a position corresponding to the top plate panel-shaped molded product manufacturing method according to any one of claims 1 to 6, characterized in that.