A light-emitting device is disclosed which allows efficient irradiation of light from a plurality of light sources to achieve a predetermined light emission characteristic and has a small size. The light-emitting device has an optical member which includes a first reflecting surface which reflects light incident thereon from a first light source, a second reflecting surface which reflects light incident thereon from a second light source, and an emergence portion which causes the light from the first reflecting surface and the light form the second reflecting surface to emerge therefrom. The optical member reflects the light by the second reflecting surface and then transmits the light through the first reflecting surface to guide the light to the emergence portion.