SURFACE LIGHT SOURCE DEVICE, DISPLAY DEVICE AND OPTICAL SHEET MANUFACTURING METHOD

A surface light source device comprises: a plurality of light sources (1), an optical sheet (2), and a diffusion plate (3). The optical sheet includes a transmission part (21) having a plurality of through holes that are configured to transmit light emitted from the light sources, and a reflection part (22) configured to reflect the light emitted from the light sources. The optical sheet is configured such that the through holes include a plurality of first through holes each having a hole diameter set according to a distance from a respective one of the light sources, and at least one second through hole each having a hole diameter set to a different size from the hole diameter set according to the distance from the respective one of the light sources.