PURPOSE: To improve the workability of bending by presetting many kinds of necessary bending angles and carrying out bending of the set angles easily in a machine for bending an edge material into a required shape when the edge material in a punching die for punching and cutting off a sheet material such as a corrugated fiber board etc., is manufactured by a punching die.

CONSTITUTION: A fixed die 3 and a movable die 7 are provided face to face on the upper surface of a working machine body 1, an edge material 20 in the shape of a long sheet inserted and held between the fixed die 3 and the movable die 7 is bent by the rolling down operation of a handle 8, a rotary table 13 provided with plural stopper shafts 15a-15f radially on the outer peripheral part is supported freely rotatively at the end part of the working machine body 1 and when the rotary table 13 is rotated, the desired stopper shafts 15a-15f can be set so that they are opposed to the handle 8.