A light emitting device comprising: a light emitting structure layer including a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer; an electrode electrically connected to the first conductivity type semiconductor layer; an electrode layer formed under the light emitting structure layer and including a plurality of conductive layers; a channel layer having an inner portion provided at a portion of at least one of the plurality of conductive layers and an outer peripheral portion of the light emitting structure layer and an outer portion extending beyond a sidewall of the light emitting structure layer from the inner portion; and a conductive support member formed under the electrode layer, wherein a first conductive layer of the plurality of conductive layers includes an ohmic layer contacting with a lower surface of the light emitting structure layer, and a second conductive layer of the plurality of conductive layers includes a first portion contacting the inner portion of the channel layer and a second portion extending to a lower surface of the channel layer, characterized in that the conductive support member includes a first protrusion projecting from at least a portion of an upper edge of the conductive support member and a concave part recessed inward from at least one of outer lateral surface of the conductive support member, wherein the first protrusion includes at least one of metal materials constituting the electrode layer and the conductive support member, and wherein the concave part is formed at a lateral surface of the conductive support member. a light emitting structure layer including a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer; an electrode electrically connected to the first conductivity type semiconductor layer; an electrode layer formed under the light emitting structure layer and including a plurality of conductive layers; a channel layer having an inner portion provided at a portion of at least one of the plurality of conductive layers and an outer peripheral portion of the light emitting structure layer and an outer portion extending beyond a sidewall of the light emitting structure layer from the inner portion; and a conductive support member formed under the electrode layer, wherein a first conductive layer of the plurality of conductive layers includes an ohmic layer contacting with a lower surface of the light emitting structure layer, and a second conductive layer of the plurality of conductive layers includes a first portion contacting the inner portion of the channel layer and a second portion extending to a lower surface of the channel layer, characterized in that the conductive support member includes a first protrusion projecting from at least a portion of an upper edge of the conductive support member and a concave part recessed inward from at least one of outer lateral surface of the conductive support member, wherein the first protrusion includes at least one of metal materials constituting the electrode layer and the conductive support member, and wherein the concave part is formed at a lateral surface of the conductive support member.