| abstract |
An optical property such as reflectance and retardation is prevented by preventing adverse effects due to contamination of dust and the like in manufacturing, transporting and assembling processes, and preventing an adhesive used for composite such as lamination from entering a microstructure. To provide an optical member in which deterioration with time is suppressed. The substrate has at least a substrate and a porous material, the substrate has a fine structure on a surface, and an interval between adjacent fine structures is 50 to 1000 nm, and the porous material has a porosity. Is 10 to 98% on a volume basis and the refractive index n 1 is 1.0008 to 1.4, and the microstructure is covered or filled with the porous material directly or through another layer An optical member. [Selection figure] None |