Abstract: A lens-group moving apparatus for moving, in an optical system including a plurality of lenses, a lens group including at least one lens among the plurality of lenses includes: a moving lens frame that holds the lens group; a fixed cylinder that holds the moving lens frame movably in an optical axis direction; a moving frame that is movable in the optical axis direction and changes a relative position with respect to the fixed cylinder; a moving structure that causes the moving frame to move in the optical axis direction; an intermediate member that contacts the moving frame and the moving lens frame and that transmits a movement of the moving frame to the moving lens frame; and an urging member that urges the moving lens frame in a direction of the intermediate member.