Patent ID: 8228619

Claim:
A lens barrel comprising: a plurality of lens units movable in a direction of an optical axis; a driving unit including an annular actuator in which the optical axis serves as a rotation center; a first cam cylinder disposed inwardly of the annular actuator, the first cam cylinder including a circular cylindrical base portion and a large-diameter portion, the base portion rotating to drive at least one of the plurality of lens units, the large-diameter portion having an outside diameter that is larger than that of the base portion, the large-diameter portion being positioned in an area differing from an area where the annular actuator is disposed in the direction of the optical axis; a second cam cylinder configured to drive the at least one of the plurality of lens units as a result of rotating at an outer-peripheral side of the large-diameter portion; and a rotation transmitting portion provided at the large-diameter portion, the rotation transmitting portion being configured to transmit rotation of the first cam cylinder to the second cam cylinder, wherein, in a state in which a length of the lens barrel is shortest, a portion of the second cam cylinder and the rotation transmitting portion overlap a lens unit holding frame in the direction of the optical axis or an end portion of the large-diameter portion is positioned between a lens unit holding frame and the second cam cylinder so as to overlap a portion of the lens unit holding frame in the direction of the optical axis, the lens unit holding frame being disposed closest to an object side.