A pressed component manufacturing method wherein, in press forming a metal sheet into a final component shape through two or more press steps, the inflow amount of the required material is determined based on the increase in the cross-sectional line length of the shape with respect to the line length before forming when the metal sheet is press formed by a single press step, the determined amount is distributed to each step, and a preformed shape after press forming based on the distributed inflow amount. As the cross section, a line orthogonal to a direction in which the material flows when the metal sheet is drawn is set, and a plurality of cross sections is set which is individually cut by each of planes orthogonal to the line and extending in a direction along the sheet thickness direction of the metal sheet before forming.

The invention is a press-molding device which is configured to obtain a press-molded article with a hat-shaped cross section by compressing a preform with a hat-shaped cross section between a punch of a first mold and a die of a second mold. The press-molding device includes: a punch and a die forming a compression mechanism to compress a flange and a side wall of a hat-shape in the preform; a compression block forming a first pressing mechanism to press an outer end portion of the flange of the hat-shape in the preform; a pad forming a second pressing mechanism to press an upper end portion of the side wall of the hat-shape in the preform.

A press formed part manufacturing method includes: acquiring a reference press formed part shape; acquiring a wave-shaped blank press formed part shape; comparing the reference press formed part shape with the wave-shaped blank press formed part shape to obtain a portion where both shapes are deviated from each other and an amount of deviation; acquiring a periodically deviated wave-shaped blank press formed part shape; comparing the reference press formed part shape with the periodically deviated wave-shaped blank press formed part shape to obtain a portion where both shapes are deviated from each other and an amount of deviation; identifying a countermeasure required portion; providing a protrusion pattern to a portion of an upper tool and a lower tool of an actual tool for forming the press formed part; and press forming a blank using the upper tool and the lower tool provided with the protrusion pattern.