A lens barrel 2 includes an optical system including a first lens unit held by a first holder and a second lens unit held by a second holder. The lens barrel 2 includes a first cam barrel 22 to be driven rotatably about an optical axis of the optical system in zooming, a second cam barrel 29 to be driven in an optical axis direction of the optical system in synchronization with the first cam barrel 22, and a third cam barrel 28 to be driven in the optical axis direction in synchronization with the first cam barrel 22 and driven rotatably about the optical axis in focusing. The second cam barrel 29 is provided with a first linear movement groove and a first cam groove. The third cam barrel 28 is provided with a second cam groove and a second linear movement groove.