Method for manufacturing gripping tool

A method for manufacturing a gripping tool for gripping a workpiece with a plurality of top jaws each attached to a plurality of master jaws attached to a surface of a gripping tool body such that a center of the workpiece coincides with a center axis by sliding the plurality of master jaws toward the center axis,

• a first positioner that determines a distance of each top jaw from the center axis when each top jaw is attached to a corresponding one of the master jaws being formed in a direction perpendicular to a slide direction in a surface of each master jaw, the method comprising:
• a step of attaching the plurality of master jaws to the gripping tool body such that the plurality of master jaws is slidable toward the center axis;
• a step of gripping a shaping plug with the plurality of master jaws by sliding the plurality of master jaws toward the center axis;
• and
• a step of finishing, in the surface of each master jaw, the first positioner extending in the direction perpendicular to the slide direction of the master jaws in a state of the shaping plug being gripped.