To provide a chuck which does not require changing of a gripping part and exhibits a sufficient holding force for an irregular shape workpiece.

An elastic member 3 is affixed to an affixed surface 2a of the holding part 2 of an arm member 1, a through-hole 5 passing through the elastic member 3 is formed in a long shape as a recessed part along the moving direction of the arm member 1, and a workpiece contact part 7 of the holding surface 6 is divided into two parts in the orthogonal direction. In the elastic member 3, the tip end part is not fixed to the gripping part 2 and a base end part is fixed by fastening a screw 4. Furthermore, a V-shaped groove 2a1 as a relieving part of the elastic member 3 is formed on the affixed surface 2a for affixing the elastic member 3 of the gripping part 2.