The optical sheet and surface light source for a liquid crystal display device

An optical sheet comprising a three-layer laminate resin sheet composed of an outer layer which is laminated not via the adhesive layer on both surfaces of the core layer and the core layer, the resin constituting the core layer is non-crystalline resin , and the at least one plurality of convex shape on the surface of the outer layer of the formation, the glass transition temperature of the resin forming the respective outer layers 80 ° C. or higher, a resin of the main component the same composition, and the low optical sheet 10 ° C. or higher than the glass transition temperature of the resin forming the core layer. .FIELD 1