To perform fixation of a moving table for a work vise by means of turniong of a knock pin.

A work vose is configured so that a pin hole for a knock pin 28 to fix a moving table 4 furnished with a movable pawl is formed from semi- circular section groove 21 on the side with a base 1 and another semi-circular section groove 26 on the side with the moving table 4, wherein the groove 26 has a depth S greater than the radius R of the pin hole, and the knock pin 28 has a thickness U corresponding to the depth S of the groove 26. When one of such semi-circular grooves 21 on the base side is positioned mating with the semi-circular groove 26 on the table side and the knock pin 28 is turned toward the base, part of the semi-circular section of the knock pin fitted on the base side is put in the condition remaining on the side with the table side groove 26, so that the table 4 is secured to the base 1.