PURPOSE: To blank product parts on plural lines from a sheet of steel plate in one process even with a small sized pressing device without giving the interference of a scrap to a die, etc., at the time of punching the product parts on plural lines from the steel plate.

CONSTITUTION: A product part is blanked from a steel plate P with a punching die 3 of a pressing machine 4 while feeding the flat plate like steel plate P in the longitudinal direction with a feeding device 2. A cutting die 5 driven by a cutting device 6 is arranged in the feeding direction F side of the steel plate P with respect to this punching die 3, and a scrap S of the steel plate P after the product part is blanked from the steel plate P is cut successively with this cutting die 5 and removed from the steel plate P. When the product parts on one line is blanked along the feeding direction F, the steel plate P is shifted in the lateral direction W by a step and the product parts on the next line is blanked.