A semiconductor light emitting device includes a conductive substrate, a light emitting laminate including a second conductivity type semiconductor layer, an active layer, and a first conductivity type semiconductor layer stacked on the conductive substrate, a first electrode layer electrically connected to the first conductivity type semiconductor layer, a second electrode layer between the conductive substrate and the second conductivity type semiconductor layer, the second electrode layer being electrically connected to the second conductivity type semiconductor layer, and a passivation layer between the active layer and the second electrode layer, the passivation layer covering at least a lateral surface of the active layer of the light emitting laminate.