An imaging apparatus includes a front lens group, which constitutes part of an imaging optical system, at a fixed position with respect to an optical axis direction, wherein the front lens group includes a front lens element and a reflector and the reflector reflects light rays exiting from the front lens element; a movable lens group provided closer to the image plane side than the front lens group and movable along the optical axis; a support member which supports the reflector; a movable frame which supports the front lens element and is supported by the support member to be movable along a plane orthogonal to the optical axis of the front lens element; and a driver which drives the movable frame in the plane, in accordance with vibrations applied to the photographing optical system, to reduce image shake.