An illumination apparatus comprising: a planar light emitting panel; and a heat-radiating mounting member having a body plate-section, wherein the heat-radiating mounting member is configured to mount the planar light emitting panel on a mounted section, wherein the body plate-section comprises: a first through hole for feeding power that penetrates the body plate-section in a thickness direction; and a mounting-side smooth region that includes substantially no protrusion, wherein the planar light emitting panel comprises: a panel body which incorporates an organic EL element; a connecting wiring section; and a heat transfer member, wherein the connecting wiring section is configured to electrically connect the panel body to an external power source, the connecting wiring section traveling from a panel-body side of the body plate-section to an opposite side of the body plate-section through the first through hole, wherein the planar light emitting panel comprises: a front surface that is constituted by a light emitting surface including a light emitting region that emits light during lighting; and a back surface that includes a panel-side smooth region including substantially no protrusion, wherein the heat transfer member is a portion constituting the panel-side smooth region, and wherein the mounting-side smooth region and the panel-side smooth region are in surface contact with each other in an area not less than 50 percent of the light emitting region in plan view of the light emitting surface. a planar light emitting panel; and a heat-radiating mounting member having a body plate-section, wherein the heat-radiating mounting member is configured to mount the planar light emitting panel on a mounted section, wherein the body plate-section comprises: a first through hole for feeding power that penetrates the body plate-section in a thickness direction; and a mounting-side smooth region that includes substantially no protrusion, a first through hole for feeding power that penetrates the body plate-section in a thickness direction; and a mounting-side smooth region that includes substantially no protrusion, wherein the planar light emitting panel comprises: a panel body which incorporates an organic EL element; a connecting wiring section; and a heat transfer member, a panel body which incorporates an organic EL element; a connecting wiring section; and a heat transfer member, wherein the connecting wiring section is configured to electrically connect the panel body to an external power source, the connecting wiring section traveling from a panel-body side of the body plate-section to an opposite side of the body plate-section through the first through hole, wherein the planar light emitting panel comprises: a front surface that is constituted by a light emitting surface including a light emitting region that emits light during lighting; and a back surface that includes a panel-side smooth region including substantially no protrusion, a front surface that is constituted by a light emitting surface including a light emitting region that emits light during lighting; and a back surface that includes a panel-side smooth region including substantially no protrusion, wherein the heat transfer member is a portion constituting the panel-side smooth region, and wherein the mounting-side smooth region and the panel-side smooth region are in surface contact with each other in an area not less than 50 percent of the light emitting region in plan view of the light emitting surface.