Patent ID: 8705188

Claim:
A lens barrel comprising: a retention member that retains an optical system; a first guide shaft that guides the retention member to be movable along an optical axis of the optical system; and a second guide shaft that is disposed outside of the optical system so as to be parallel with the first guide shaft, wherein the retention member includes: a first engaging portion that engages with the first guide shaft; a second engaging portion that engages with the second guide shaft, the second engaging portion being disposed at an opposite side to the first engaging portion relative to the optical axis; and an abutting portion disposed at a position that is offset in the optical axis direction from the first engaging portion, the abutting portion being disposed to an arm portion extending from the second engaging portion along the second guide shaft, the abutting portion having an abutting surface extending along a direction intersecting with a diametric dimension of the optical system, the abutting surface being abuttable against an abutted portion when a force in the optical axis direction is applied at least to the retention member.