To facilitate-and ensure the clamping work for a cut material when the cut material is clamped by a vice wherever the terminal of the cut material is positioned.

A rotation regulating member 17 by which the rotational angle of a moving vice 12 is regulated is threadedely fitted to the moving vice 12. In the case that a cut material 18 is clamped by the moving vice 12 and a fixed vice 14, the moving vice 12 is going to rotate in a right direction when the vice surface 12a of the moving vice 12 is brought in contact with the cut material 18, however, the rotation regulating member 17 is brought in contact with a vice screw 10 so that the rotational angle of the moving vice 12 is regulated.