Abstract: An optical functional film containing a siliceous material, wherein a refractive index nA of one surface A of said optical functional film to light is larger than a refractive index nb of the other side surface B to light, and the refractive index to light gradually decreases from said surface A to said surface B and wherein when a refractive index of a medium X coming into contact with said surface A is nx and a refractive index of a medium Y coming into contact with said surface B is ny, the relation ny<nb<na<nx is satisfied and wherein the film is manufactured by the steps of a first layer forming step and a second layer forming step; and a heating step of heating to cure said first layer and said second layer, wherein the contacting parts of said first layer and said second layer are compatibilized.

Abstract: [Problem] To provide an optical functional film having less light reflection and having less wavelength dependency of transmittance, and a method for manufacturing the same. [Means for Solution] An optical functional film, wherein a refractive index nA of one surface A of the optical functional film to light is larger than a refractive index nB of the other side surface B to light, and the refractive indices to light decreases gradually from the surface A to the surface B. The optical functional film can be manufactured by conducting multi-layer coating using compositions comprising two kinds of polysiloxane and of solvent on a substrate, compatibilizing the contacting parts of two layers, and thereafter heating them to cure.