Provided is a socket which includes: an outer socket, an inner socket arranged to face an inner periphery of the outer socket, a coil spring (urging member) configured to urge the inner socket toward one end of the outer socket, and a lock/unlock mechanism configured to restrict the inner socket displaced toward the other end of the outer socket against an urging force of the coil spring from being rotated with respect to the outer socket.

Provided is a socket which includes: an outer socket, an inner socket arranged to face an inner periphery of the outer socket, a coil spring (urging member) configured to urge the inner socket toward one end of the outer socket, and a lock/unlock mechanism configured to restrict the inner socket displaced toward the other end of the outer socket against an urging force of the coil spring from being rotated with respect to the outer socket.