To provide a sequential forming apparatus which is the one for forming a thin metal plate, wherein the thin metal plate is formed in a short time without any shrinkage at a corner part of large deformation, the cost is reduced, and the structure is simple and energy required for the forming is reduced.

In the sequential forming apparatus 1, a blank 30 is set on an upper surface of a lower die 10 having a forming die part 11, and the blank is pressed against the upper surface of the lower die by a clamper 2. Oil filled in an oil pool 6 formed of the blank and the forming die part is sucked by a decompression pump 4 via a piping system 20, the pressure in the oil pool is reduced to execute the decompression forming of the entire blank, and the upper surface of the blank is pressed by a bar tool 2 so as to follow the contour of the forming die for perform the sequential forming, and the blank is formed in a predetermined shape.

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