To provide a retractable lens barrel which comprises a bent-type photographic optical system formed by a plurality of lens groups L1, L2 and offers reduced thickness by employing a simple movement mechanism of the lens groups and a prism 32.

A lens barrel of the present invention is configured such that, when shifting from a shooting position to a retracted position, a holding member holding a folded optical element is brought into contact with a cylindrical body moving in a first optical axis direction toward the imaging plane side, which causes the holding member to rotate about a third axis perpendicular to the first optical axis and a second optical axis and slide along the second axis direction.