PURPOSE: To execute surer spatial rolling and stretch-bending by moving a bending mandrel station in agreement with the movement of a roll which is pressed from the outside onto the mandrel bending station.

CONSTITUTION: One end in the longitudinal direction of a work 16 to be formed is fixedly tightened to a bending tool 1 on a rotary table 2 and simultaneously the other end is fixedly tightened to a clamp head 18 of a clamp pedestal 12. Three spatial planes X, Y, Z are bent by rotationally driving the rotary table and simultaneously adding a torsional stress to a reciprocating pedestal 4 in the Z direction and/or a universal bearing 5 depending on the situation. At this time, the proper movement is introduced with three spatial shafts of a shape roll bending station 7 in order to bend the work 16 in the optional direction.