Patent ID: 7744294

Claim:
A lens barrel configured to change, from a collapsed state established by retracting at least part of multiple lens groups so as to house the lens groups into a main body, to an image-taking state by moving at least part of the lens groups toward an object, the lens barrel comprising: a retracting lens formed of at least one of the lens groups, located on the same optical axis as an optical axis of the rest of the lens groups in an image-taking state, and configured to retract to a housed position outside an inner diameter of the lens barrel in a collapsed state; a retracting lens holder frame configured to hold and move the retracting lens; a cam portion formed on the retracting lens holder frame; and a retracting lens holder frame driving member configured to drive the retracting lens holder frame held inside the lens barrel by contacting the cam portion, the cam portion having a cam shape so as to drive the retracting lens to an image-taking position and to the housed position by utilizing the retracting lens holder frame driving member, and wherein the retracting lens holder frame driving member includes a contact portion configured to contact the cam portion and a stopper protruding from the contact portion toward the cam portion and configured to prevent the retracting lens holder frame driving member from exceeding a housing region in the cam shape and from moving outside the cam portion on the retracting lens holder frame.