A lens barrel includes: a frame for holding an optical lens, the frame having a bottomed circular recess formed in its outer peripheral surface; a cam follower fixed to an outer diameter portion of the frame with screws, the cam follower including a core and a collar provided on an outer periphery of the core; and a barrel member having a guide groove into which the cam follower is fitted, the guide groove determining a position of the frame, in which under a state in which the cam follower is mounted to the outer diameter portion of the frame, an outer diameter portion of the collar is fitted to an inner diameter portion of the circular recess, and one end surface of the core abuts on a bottom surface of the circular recess and another end surface of the core abuts on a head of the screw.