An embodiment comprises: a substrate; a light emitting unit including a light emitting diode disposed on the substrate; a light receiving unit including a lens barrel and a sensor; a case housing the light emitting unit; a diffusing unit coupled to the case and disposed above the light emitting unit; a circuit substrate coupled to the substrate and the sensor; a first wire electrically connecting the light emitting unit and the substrate; and a second wire electrically connecting the substrate and the circuit substrate.