To prevent any worked parts from being deformed by the subsequent successive forming when successive forming is separately performed on a plurality of parts.

The periphery of a plate 10 is fixed by a supporting frame 11 and a clamp 12, a die-shaped pressing member 13 is disposed on a lower side, and pushed up to entirely form the plate 10 in a rough shape by the die- pressing forming (AB). In addition, an upper part of a skirt part 15a which is a part of a complicated shape and cannot be fully formed by the die-pressing is subjected to the first sequential forming by a bar-shaped pressing member 20 (B). Successively, a protective tool 21 comprising a ring-shaped flexible member is placed on the sequentially formed part so as to surround a formed projecting part 15, and pressed by a pressing block 22 to fix the worked part. Then, an upper part of a formed recessed part 16 adjacent to the outside of the protective tool 31 is subjected to the second sequential forming by the bar- shaped pressing member 20. In this condition, the worked part surrounded by the protective tool 21 is not deformed, and the formed shape can be maintained.