A backlight 10 includes a light source 13, a light guide plate 12 for introducing light emitted from the light source 13 from an incidence surface 12a provided on an end and for emitting the light from one surface, a diffusive reflector 15 provided such that the surface having a minute concavo-convex portion 15d faces the other surface of the light guide plate 12, and a light directivity control sheet 17 provided on the one surface of the light guide plate 12 such that the apexes 17c of pyramid-shaped objects 17b face the opposite side to the light guide plate 12.