A unit of light-emitting elements includes: a plurality of light-emitting elements; and a binder extending around a periphery of the light-emitting elements and fixing the light-emitting elements. Each of the light-emitting elements includes: first and second semiconductor layers; and an active layer therebetween. A first semiconductor layer, an active layer, and a second semiconductor layer of a first light-emitting element are arranged along a first direction in this order, and a second semiconductor layer, an active layer, and a first semiconductor layer of a second light-emitting element are arranged along the first direction in this order.