Method of manufacturing molded product

A method of manufacturing a molded product, the method comprising:

• welding an inner metallic plate to an outer metallic plate after placing the inner metallic plate and the outer metallic plate on each other to form a first joining portion;
• bending, after forming the first joining portion, the outer metallic plate with the inner metallic plate in a first direction by performing a first press working;
• and
• bending, after the first press working, the outer metallic plate with the inner metallic plate in a second direction, which is opposite from the first direction, by performing a second press working,
• wherein, in the second press working, a first surface, a second surface which extends in a direction intersecting with the first surface, and a curved portion which couples the first surface to the second surface and on which the inner metallic plate is placed are formed on the outer metallic plate,
• wherein, in the first press working, at least one oppositely curved portion which is bent in a direction opposite from a bending direction of the curved portion and on which the inner metallic plate is placed is formed on the outer metallic plate,
• wherein the at least one oppositely curved portion is formed to overlap an area on the outer metallic plate that is to be the curved portion,
• wherein the inner metallic plate is situated on an outer side of the at least one oppositely curved portion after the first press working is performed and is situated on an inner side of the curved portion after the second press working is performed, and
• wherein the first joining portion is a portion where the inner metallic plate is welded to an area on the outer metallic plate that is to be the first surface.