Panel-shaped formed product and method for producing panel-shaped formed product

A method for producing a panel-shaped formed product, wherein

• the panel-shaped formed product includes a polygonal top panel portion, a vertical wall portion extending from at least not less than two adjacent borders among borders of the top panel portion, and a step portion provided in at least one pair of each vertical wall portion of pairs of adjacent vertical wall portions among the vertical wall portions,
• the production method comprising:
• a preparation step of preparing a blank material made of a metal sheet,
• a heating step of heating the blank material, and
• a press forming step of applying press working by hot stamping forming to the heated blank material to form the blank material into the panel-shaped formed product, wherein
• the press forming step uses a press working apparatus that includes:
• a die having a die engraved portion in which the shape of the panel-shaped formed product is formed,
• a first punch having a front end surface which faces the die and in which the shape of the top panel portion is shaped,
• a second punch which is adjacent to outside of the first punch and has a front end surface in which the shape of the step portion is shaped, and
• a blank holder existing adjacent to at least a part of the outside of the second punch and facing the die, wherein
• the blank material is disposed between the die, and the blank holder, the first punch and the second punch, and the blank holder, the first punch, and the second punch are relatively moved with respect to the die to push in the first punch and the second punch on the blank material, thereby forming the same into the panel-shaped formed product.