PURPOSE: To surely stick a vise at the desired position on a workbench of various types with a low-cost shoe by arranging a thrust plate eccentrically with the bolt axis, and arranging a bolt slidably in a vertical slot formed on a clamping cover plate.

CONSTITUTION: A cover plate 2 is supported on a thrust plate 5, the thrust plate 5 is movably connected to the cover plate 2 by a bolt 6, and it is eccentrically arranged with respect to the bolt axis A and has a notched head section 6a. A tenon block 8 is inserted into the T-groove 9 of a workbench M, and the head section of a clamping screw 7 is supported on the cover plate 2 via a shim 10. One end of the cover plate 2 is put to the clamping face 12a of the slender portion 12 of a vise S to be fitted, the thrust plate 5 is rotated while being slid along a vertical slot 3, then the thrust plate 5 can be moved to a proper position, and the center of the thrust plate 5, the axis Al of the clamping screw 7 and the area where the cover plate 2 is supported on the clamping face 12a are aligned.