It is an object of the present invention to provide a lens barrel in which operability for a user is increased and a reduction in parts is achieved while provided with a manual operating member. There is provided the lens barrel that is provided with an imaging optical system for forming an optical image of an object, a focus lens unit which is included in the imaging optical system and capable of changing an object distance by moving in a direction parallel to an optical axis of the imaging optical system, moving means for moving the focus lens unit in the direction parallel to the optical axis, driving means for driving the moving means, a focus ring which is of a cylindrical shape coaxial to the optical axis of the imaging optical system and manually operated in a rotational manner in order to drive the driving means to thereby move the focus lens unit by the moving means, and a focus mode switching button which is integrally provided in the focus, and operated in order to switch between a state of allowing a manual rotating operation of the focus ring and a state of preventing the manual rotating operation.