Provided is a lens barrel having a movable frame that moves in a direction of an optical axis of an imaging optical system and a cylinder member that is movable in the direction of the optical axis and is rotatable about the optical axis. A hole is provided in any one of the movable frame and the cylinder member and a shaft portion of a fitted member fitted into the hole is fitted into a groove provided in the other, and thereby the movable frame and the cylinder member are engaged.