Disclosed is a semiconductor light emitting device. The semiconductor light emitting device comprises a substrate; a light emitting structure comprising a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer on the substrate; an electrode layer on the second conductive semiconductor layer; and an electrode on the electrode layer, wherein the substrate comprises a plurality of convex portions, wherein the electrode layer comprises a plurality of holes corresponding to a region of at least one of the plurality of convex portions of the substrate, wherein an insulating material is disposed in the plurality of holes on the light emitting structure.