A lighting device may be provided to include a heat sink (400) which includes a receiving recess (470) and a top surface (410) including a hole (411-3); a light source module (200) which includes a substrate (210) disposed on the heat sink (400), a light emitting device (213) disposed on the substrate and a pad (215) disposed on the substrate (210); a power supplier (600) which is disposed in the receiving recess (470) of the heat sink (400) and includes a projection (610) outputting a power signal for driving the light source module (200); and a connector (250) which is coupled to the hole (411-3) of the heat sink (400), includes a contacting part (251-1, 251-2) electrically connected to the pad (215) of the light source module (200), and is electrically connected to the projection (610) of the power supplier (600), wherein the connector includes a recess (253-1) to which the projection (610) of the power supplier (600) is coupled and a connection portion (253-3) which is disposed in the recess and is electrically connected to the contacting part (251-1, 251-2), and the projection (610) of the power supplier (600) includes an electrod plate (611) which outputs the power signal and is connected to the connection portion (253-3).