PURPOSE: To prevent a deflection by clamping a bending jig and to perform a continuous bending by selecting more than two bending means provided with the bending jig pinching a work, the clamp part engaged with the rotary center of the bending jig and the driving means rotating the both, and moving them to the bending position.

CONSTITUTION: The right and left bending jigs 6, 66 are clamped by the right and left clamp devices 72 at the bending time of a pipe W and these are driven with rotation by synchronizing by the right and left driving devices 16, 76, so the working of good accuracy can be performed in a lump for three pieces of pipes W. Since one part of the right and left bending devices 1, 2 is moved to the bending position according to the bending direction by a moving device 4 the right and left bending can be performed in succession. Moreover, a table device 5 is rotated in the working direction simultaneous with the rotation and the generation of a flaw on the pipe W can be prevented by the sliding of the pipe W and table device 5. The adjustment of the working accuracy can be performed as well by the right or left bending device 1, 2 solely.