PURPOSE: To reliably fix and hold various work materials having different width dimensions.
CONSTITUTION: A horizontally moving pedestal 4 having a projecting part 4-2 having a gradient surface 4-3, a horizontally moving body 5 having a gradient surface 5-1 opposed to this and a raising and lowering body 6 having taper surfaces 6-1 and 6-2 arranged between both so as to come into contact with both gradient surfaces, are provided. A fastening screw 7 to push-press the raising and lowering body 6 downward by screw-fitting to the horizontally moving pedestal 4 while passing through the raising and lowering body 6 and a suppressing means to suppress the horizontally moving body 5 in the direction of the projecting part 4-2 when it is raised, are provided. Pin screw holes 1-2a... and pin holes having a different pitch width respectively are formed in a base 1 and an opposite surface part of the horizontally moving pedestal 4, and the holes are selected according to a work material 10, and a positioning and fastening pin screw 9 is fitted, positioned and fixed.