Patent ID: 7963706

Claim:
A lens barrel, comprising: a plurality of lens groups; a first cylinder configured not to retain the plurality of lens groups; and a second cylinder disposed at an object side of the first cylinder and configured to retain at least one portion of the plurality of lens groups, the first cylinder having a space in which the second cylinder is accommodated, wherein the first cylinder and the second cylinder are moved between a collapsed state in which the at least one portion of the plurality of lens groups is collapsed and a photographing state in which the at least one portion of the plurality of lens groups is extended to an object side, the plurality of lens groups has at least one retractable lens group which is a lens group other than the at least one portion retained by the second cylinder, in the photographing state, the plurality of lens groups are disposed on a photographing optical axis, in the collapsed state, the at least one retractable lens group is positioned at a retracted position which is out of the photographing optical axis and outside a maximum outer diameter of the first cylinder, the second cylinder is accommodated in the space of the first cylinder, which is formed when the at least one retractable lens group is moved in the collapsed state.