Chuck device

A chuck device comprising:

• a cylindrical chuck formed so that at least a part in an axial direction is circumferentially divided, including a first contact part on a first side in the axial direction and a second contact part on a second side opposite to the first side, and configured to hold a bar-like workpiece;
• a tubular outer cylinder covering an outer peripheral side of the chuck, and including, on the first side, a restriction part configured to restrict axial movement of the chuck by abutting on the first contact part;
• and
• a sleeve provided in an axially movable manner on an inner peripheral side of the outer cylinder, and including, on the first side, a pressing part axially driven to abut on the second contact part, wherein
• a movement-restricting tapered face is formed in the restriction part of the outer cylinder,
• a pressing tapered face is formed in the pressing part of the sleeve,
• the chuck includes, in the first contact part, a first tapered face whose outer diameter reduces toward an end on the first side, and includes, in the second contact part, a second tapered face whose outer diameter reduces toward an end on the second side,
• the first tapered face includes at least two tapered face parts,
• angles respectively formed between the at least two tapered face parts and the center axis of the chuck are different from each other, and
• each of the at least two tapered face parts abuts on the movement-restricting tapered face.