The light-emitting device according to one embodiment includes a substrate; a plurality of light-emitting cells disposed on the substrate so as to be spaced apart from each other; and a connection line configured to electrically interconnect neighboring light-emitting cells, wherein each of the light-emitting cells includes: a light-emitting structure including a first semiconductor layer, an active layer, and a second semiconductor layer disposed on the substrate; and first and second electrodes configured to be electrically connected to the first and second semiconductor layers respectively, wherein the light-emitting cells include: a first power cell configured to receive first power via the first electrode; and a second power cell configured to receive second power via the second electrode, and wherein the first electrode in the first power cell has a first planar shape different from a second planar shape of the second electrode in the second power cell.