LED light source substrates (140) in an edge-light type surface light source device are disposed with a light guide plate interposed therebetween. A length of each of the LED light source substrates is shorter than a length of a plane of incidence of the light guide plate. The chromaticity of light from a central part (141) is uniform, and the chromaticity of light from ends (142) is more shifted toward blue than the chromaticity of light from the central part (141).