Patent ID: 8743487

Claim:
A lens barrel that is configured to adjust a position of an adjusted lens in the direction of an optical axis with respect to another lens, the lens barrel comprising: a first retaining frame configured to retain the adjustment lens; and a second retaining frame configured to adjustably retain the first retaining frame, wherein one of the first and the second retaining frames comprises a first adjustment surface group including a plurality of adjustment surfaces that are adjacently disposed in the direction of rotation about the optical axis of the adjustment lens and are provided with different heights, and a second adjustment surface group having a different configuration from the first adjustment surface group, having a plurality of adjustment surfaces that are adjacently disposed in the direction of rotation of the adjustment lens and are provided with different heights, and disposed at a position exhibiting a 180 degree rotational phase from the position of the first adjustment surface group, and wherein the retaining frame of either the first or second retaining group that is not provided with the first and the second adjustment surface groups comprises a supporting portion configured to abut with the first adjustment surface group or the second adjustment surface group.