A surface light source device includes a first light source disposed so as to face a reflecting surface of a reflecting member, a second light source having spectrum selectivity different from that of the first light source, a light diffusing member configured to diffuse light rays emitted from the first and second light sources, and a transparent light control member disposed between the first light source and the light diffusing member so as to face the first light source and the light diffusing member. The light control member directs the light rays emitted from the first and second light sources in predetermined directions. The second light source faces an outer peripheral surface of the light control member. The light ray emitted from the second light source is directed by the light control member inside the light control member so as to be output towards the light diffusing member.