According to [configured] (A) the present invention, rising mirror member (31), drive means (33), said drive means (33) by said punch member (31) can be a compression about, self-propagating e centering on the center of its own which can be die member (32) and, said die member (32) skidding of trajectory groove (41), and the supporting members are a (36) with bending device is provided. Between punch and die in the present invention according to bending of material in the device to the a shaft by the friction force to of the material surface can be minimized since. inhibit. The bending a device in particular color to the material is rolling real estate can be conserved as the for guaranteeing the quality of the final articles thereby can be.