FORWARD/BACKWARD MOVEMENT DEVICE

In a forward/backward movement device, a forward/backward member moves so as to move forward or backward while rotating relative to the case; a restriction member is provided so as to be capable of moving between a restriction position for restricting the forward/backward member, and a release position for releasing the restriction, and restricts the forward/backward member by engaging a forward/backward member-side member in the restriction position; a drive unit is provided on the same side as is the forward/backward position control mechanism relative to the restriction member and the forward/backward member; and the drive shaft extends so as to include the direction in which the forward/backward member extends as a directional component.