To provide a lens barrel provided with a cam barrel which is molded without causing an undercut to a mold even though a cam is laid over and arranged in an optical axis direction by removing mold for instance in the radial direction centering an optical axis or the like and in which a parting line exists neither at a cam groove nor at the projected line cam of a cylindrical outer face and to provide a cam barrel mold.

In the lens barrel provided with the cam barrel made of a synthetic resin having the projected line cam on the outer face, at least one cam face of the projected line cam is inclined toward the side of the other cam face from the radial direction centering the optical axis.