Provided is a tool chuck that allows precision gripping of a tool by a collet when this collet is pushed into a chuck body.The tool chuck includes a collet for gripping a tool, a chuck body having, at a leading end thereof, a receiving portion for receiving the collet inserted therein along an axis thereof, a holder containing the collet therein and configured to be movable together with the collet along an axial direction based on the axis, and a nut fitted on the chuck body (2) in a radial direction based the axis and containing the holder in the radial direction. The holder has a movement allowing mechanism for allowing the holder to move relative to the nut along the axial direction when the nut is moved relative to the chuck body along the axial direction.