A semiconductor light emitting device includes a plurality of light emitting cells including a first conductivity type semiconductor layer, a second conductivity type semiconductor layer, and an active layer between the first and second conductivity type semiconductor layers, an insulating layer on the plurality of light emitting cells and having a first opening and a second opening defining a first contact region of the first conductivity type semiconductor layer and a second contact region of the second conductivity type semiconductor layer, respectively, in each of the plurality of light emitting cells, a connection electrode on the insulating layer and connecting the first contact region and the second contact region to electrically connect the plurality of light emitting cells to each other, a transparent support substrate on the insulating layer and the connection electrode, and a transparent bonding layer between the insulating layer and the transparent support substrate.