A lens barrel is detachably attached to a camera body, and includes an exterior unit, a rear frame, a tripod mount, and a tripod lock screw. The exterior unit includes an optical system. The rear frame is mounted to the exterior unit so as to be rotatable around an optical axis. An outer peripheral surface of the lens barrel is configured with the exterior unit and the rear frame. The tripod mount is provided on the rear frame to be fixed to a tripod. The tripod lock screw fixes a rotational position around the optical axis of the rear frame to the camera body at a predetermined rotational position, in a state in which the lens barrel is mounted to the camera body.