The lens barrel includes first (19), second (17) and third (16) barrels concentrically arranged in this order from an optical axis of the lens barrel. At least one cam (17b) slot is formed on the second barrel and extending obliquely to a direction of the optical axis. At least one guide groove (16c) is formed on an inner periphery of the third barrel. At least one follower (19a) is formed on an outer periphery of the first barrel for engaging with the at least one guide groove through the at least one cam slot. At least one member (17e) is integrally formed on an outer periphery of the second barrel adjacent an end of the at least one cam slot. The member comprising a surface formed for contacting the at least one follower when the at least one follower moves to the end of the at least one cam slot. The guide groove extends in the direction of the optical axis.
