A cam ring of a substantially annular shape for a lens barrel including at least one cam groove in which a guide pin provided on a lens group which is movable in an optical axis direction is placed and a gear which is provided on an outer periphery of the cam ring to rotate the cam ring, wherein at least a part of the cam groove is in the form of an inner cam groove with a closed bottom located on the outer surface thereof. The gear is integrally formed on the outer surface of the cam ring. The invention is also directed to a method for manufacturing such a cam ring.