A lighting device comprising: a heat sink which includes a receiving recess and a top surface including a hole; a light source module which includes a substrate disposed on the heat sink, a light emitting device disposed on the substrate and a pad disposed on the substrate; a power supplier which is disposed in the receiving recess of the heat sink and includes a projection outputting a power signal for driving the light source module; and a connector which is coupled to the hole of the heat sink, includes a contacting part electrically connected to the pad of the light source module, and is electrically connected to the projection of the power supplier, characterized in that the light source module comprises: a first light source unit which includes a first substrate, a first light emitting device and a first and a second pads; a second light source unit which includes a second substrate, a second light emitting device and a third and a fourth pads; and a connecting plate which electrically connects the first pad of the first light source unit and the third pad of the second light source unit, and wherein the connector comprises a first contacting part and a second contacting part, wherein the first contacting part receives a first power signal and is electrically connected to the second pad of the first light source unit, and wherein the second contacting part receives a second power signal and is electrically connected to the fourth pad of the second light source unit. a heat sink which includes a receiving recess and a top surface including a hole; a light source module which includes a substrate disposed on the heat sink, a light emitting device disposed on the substrate and a pad disposed on the substrate; a power supplier which is disposed in the receiving recess of the heat sink and includes a projection outputting a power signal for driving the light source module; and a connector which is coupled to the hole of the heat sink, includes a contacting part electrically connected to the pad of the light source module, and is electrically connected to the projection of the power supplier, characterized in that the light source module comprises: a first light source unit which includes a first substrate, a first light emitting device and a first and a second pads; a second light source unit which includes a second substrate, a second light emitting device and a third and a fourth pads; and a connecting plate which electrically connects the first pad of the first light source unit and the third pad of the second light source unit, and wherein the connector comprises a first contacting part and a second contacting part, wherein the first contacting part receives a first power signal and is electrically connected to the second pad of the first light source unit, and wherein the second contacting part receives a second power signal and is electrically connected to the fourth pad of the second light source unit. a first light source unit which includes a first substrate, a first light emitting device and a first and a second pads; a second light source unit which includes a second substrate, a second light emitting device and a third and a fourth pads; and a connecting plate which electrically connects the first pad of the first light source unit and the third pad of the second light source unit, and wherein the connector comprises a first contacting part and a second contacting part, wherein the first contacting part receives a first power signal and is electrically connected to the second pad of the first light source unit, and wherein the second contacting part receives a second power signal and is electrically connected to the fourth pad of the second light source unit.