A lighting device comprising: a heat sink (140, 240) which comprises one surface and a receiving recess; a light emitting module (130, 230) which is disposed on the one surface of the heat sink (140, 240) and comprises a substrate (131, 231) and a plurality of light sources (133, 233) disposed on the substrate (131, 231), wherein the substrate (131, 231) has a hole and a plurality of via-holes; a power controller (150, 250) which is electrically connected to the light emitting module (130, 230) through the via-hole of the substrate (131, 231), an insulating inner case which receives the power controller (150, 250) therein and is disposed in the receiving recess of the heat sink (140, 240); characterized in that the light emitting module (130, 230) comprises a first light emitting module comprising a first substrate having a first hole and a plurality of first via-holes arid a plurality of first light sources, and a second light emitting module comprising a second substrate having a second hole and a plurality of second via-holes and a plurality of second light sources, wherein the first substrate and the second substrate are disposed adjacent to each other, wherein a distance from the center of one of the first light sources to the center of the first hole of the first substrate is the same as a distance from the center of said one of the first light sources to the center of one of the second light sources of said second light emitting module, wherein the power controller comprises a first electrode pin and a second electrode pin which supply electric power to the first light emitting module and the second light emitting module from the power controller, wherein the first electrode pin is inserted into one of the first via-holes and the second electrode pin is inserted into one of the second via-holes, and wherein the light emitting module further comprises a connector which is electrically connected each via-hole of said first and second light emitting modules such that said first and second light emitting modules are electrically connected to each other. a heat sink (140, 240) which comprises one surface and a receiving recess; a light emitting module (130, 230) which is disposed on the one surface of the heat sink (140, 240) and comprises a substrate (131, 231) and a plurality of light sources (133, 233) disposed on the substrate (131, 231), wherein the substrate (131, 231) has a hole and a plurality of via-holes; a power controller (150, 250) which is electrically connected to the light emitting module (130, 230) through the via-hole of the substrate (131, 231), an insulating inner case which receives the power controller (150, 250) therein and is disposed in the receiving recess of the heat sink (140, 240); characterized in that the light emitting module (130, 230) comprises a first light emitting module comprising a first substrate having a first hole and a plurality of first via-holes arid a plurality of first light sources, and a second light emitting module comprising a second substrate having a second hole and a plurality of second via-holes and a plurality of second light sources, wherein the first substrate and the second substrate are disposed adjacent to each other, wherein a distance from the center of one of the first light sources to the center of the first hole of the first substrate is the same as a distance from the center of said one of the first light sources to the center of one of the second light sources of said second light emitting module, wherein the power controller comprises a first electrode pin and a second electrode pin which supply electric power to the first light emitting module and the second light emitting module from the power controller, wherein the first electrode pin is inserted into one of the first via-holes and the second electrode pin is inserted into one of the second via-holes, and wherein the light emitting module further comprises a connector which is electrically connected each via-hole of said first and second light emitting modules such that said first and second light emitting modules are electrically connected to each other.