A retractable lens barrel achieving thinning thereof in both directions parallel and perpendicular to a photographic optical axis. The lens barrel has a first lens and a second lens disposed in an inside thereof, and has a structure in which an optical axis of the second lens is aligned with an optical axis of the first lens when photographing, and the first lens is moved to a housed position and the second lens is moved in a retreating direction from the optical axis of the first lens when the first and second lenses are retracted. The lens barrel also has a holding member for holding the second lens and a rotation unit for rotating the holding member of the second lens, the holding member being rotated about a rotation shaft different from the optical axis of the first lens and perpendicular to the optical axes of the first and second lenses.