Patent ID: 8111468

Claim:
A lens barrel comprising: a movable lens unit movable in an optical-axis direction; an actuator configured to move the movable lens unit in the optical-axis direction; a guide member configured to guide the movable lens unit in the optical-axis direction; and a guide-member-holding portion holding the guide member, wherein the guide member is held by the guide-member-holding portion with one end thereof being in a press-fitted state and the other end thereof being in a non-press-fitted state, wherein a coefficient of linear expansion of the guide member and a coefficient of linear expansion of the guide-member-holding portion are different from each other, wherein the end of the guide member that is in the press-fitted state resides closer to a movable range of the movable lens unit than the other end of the guide member, wherein the non-press-fitted state means a state where there is a space between the other end of the guide member and a bottom surface of a hole in the guide-member-holding portion, into which the other end of the guide member is inserted, and wherein the space is large enough for the other end of the guide member not to come into contact with the bottom surface of the hole in the guide-member-holding portion, into which the other end of the guide member is inserted, even when temperature changes.