To provide an inexpensive vise mechanism capable of surely fastening of a cut material and adjusting fastening force of a vise steplessly in accordance with the cut material.

When a moving vise 10 abuts to a cut material, a steel ball 13 runs up on the slope of a recessed groove part 11d provided in the periphery 11b of a vise screw 11, a handle 12 is raced and turning force to the vise screw 11 is prevented from being transmitted. A bolt 15 is in/out moved, pressing force of a spring 14 is changed, turning force from the handle 12 to the vise screw 11 is regulated, and the fastening force of the moving vise 10 is regulated.