It is expected to provide a lighting apparatus that can improve the radiation performance. In a lighting apparatus that includes a light source unit and a heat sink radiating the heat generated by the light source unit and is recessed and installed to an attaching hole opened on a mounted portion, the heat sink is exposed at least partially to a side where the light from the light source unit is emitted from the attaching hole. For example, when installed to a ceiling having a heat insulated structure, the heat generated by the light source unit and transferred to the heat sink is transferred inside the heat sink and radiated from one part to the air at the side where the light from the light source unit is emitted from the attaching hole. Therefore, the radiation performance can be improved.