A lens barrel includes a mount member configured to couple the lens barrel to a camera body, the mount member having a coupling surface for coupling with the camera body, a lens holding frame holding a lens and movable along an optical axis, the lens holding frame having a sleeve portion, the sleeve portion having a front end and a rear end, and a guide bar configured to guide the sleeve portion of the lens holding frame along the optical axis. The guide bar extends to a location nearer to an image plane than the coupling surface of the mount member. The rear end of the sleeve portion is disposed nearer to the image plane than the lens.