To provide a jig for measurement and a wire saw, in which workability is improved and a working efficiency is improved thanks to no need of adjustment each time a workpiece is mounted on a workpiece support section, of the posture of the workpiece relative to the wire saw.

The wire saw includes: a workpiece support section 27 capable of adjusting the position around an axis extending in the vertical direction; and a jig for workpieces detachably attached to the workpiece support section 27 through a plurality of clamp fittings 30 having the positioning function. In place of the jig for workpieces, the jig for measurement 42 is provided to be detachably attached to the workpiece support section 27 through the clamp fittings 30. The jig for measurement 42 is equipped with a camera 44 for detecting the position of a wire 25 between main rollers of the wire saw. The position of the workpiece support section 27 is adjusted based on the position of the wire 25 detected by the camera 44, and the clamp fittings 30 are positioned to predetermined positions relative to the wire 25.