PURPOSE: To secure sufficient strength with the high degree of freedom in design of a press die even in performing a blank layout, making a feed bridge width zero in progressive press working.

CONSTITUTION: The peripheral part of a first work part 26 is cut, leaving connecting parts 44 and 46 in sections C to E, the first work part 26 is rotated around the connecting parts 44 and 46 in a section F, and the first work part 26 is made to erect so that it is approximately orthogonally crossed to a feeding direction. In that state, flange bending working bending the boundary part of the first work part 26 and a second work part 28, is performed by using a bending punch with sufficient thickness corresponding to a gap between the first work part 26 and the second work part 28.