Patent ID: 8477430

Claim:
A lens barrel comprising: a first optical unit and a second optical unit, and the lens barrel being configured to move each of the first optical unit and the second optical unit in an optical axis direction for zooming; a linear movement cylinder configured to move in an optical axis direction, the linear movement cylinder including a key configured to guide the first optical unit; a rotation cylinder that includes an outer circumferential cam on an outer circumferential surface and an inner circumferential cam on an inner circumferential surface, the rotation cylinder being configured to move in the optical axis direction with the linear movement cylinder, the rotation cylinder being further configured to rotate around an optical axis so as to move the first optical unit in the optical axis direction through the outer circumferential cam and so as to move the second optical unit in the optical axis direction through the inner circumferential cam; and a guide bar held by the linear movement cylinder and configured to guide the second optical unit in the optical axis direction.