NOVELTY - A resin film (100) comprises thermoplastic resin layer (10) formed using thermoplastic resin and curable resin layer (11) on thermoplastic resin layer. The glass transition temperature of thermoplastic resin is 250 degrees C or more. The total light transmittance of thermoplastic resin layer is 85% or more. The hue of thermoplastic resin layer is changed to such level that hue b value becomes 2 or less when thermoplastic resin layer is heated. The curable resin layer is formed by hardening the curable resin composition containing curable monomer and/or hardenable oligomer.    USE - Resin film is used for transparent substrate (claimed). Uses include but are not limited to liquid crystal display, plasma display, organic electroluminescent display, electronic paper, solar cell and organic electroluminescent element.    ADVANTAGE - The resin film has excellent heat resistance and yellowish discoloration resistance.    DETAILED DESCRIPTION - A resin film comprises thermoplastic resin layer formed using thermoplastic resin and curable resin layer positioned on thermoplastic resin layer. The glass transition temperature of thermoplastic resin is 250 degrees C or more. The total light transmittance of thermoplastic resin layer is 85% or more. The hue of the thermoplastic resin layer is changed to such a level that hue b value becomes 2 or less when thermoplastic resin layer is heated in air at 25-250 degrees C. The curable resin layer is formed by hardening the curable resin composition containing curable monomer and/or hardenable oligomer. The content of solvent in curable resin composition is 1 wt.% or less with respect to total quantity of curable resin composition. The storage elastic modulus of curable resin layer at 250 degrees C is 20% or more with respect to the storage elastic modulus at 30 degrees C. An INDEPENDENT CLAIM is included for transparent substrate, which comprises inorganic glass and the resin film positioned at the one or both surfaces of the inorganic glass.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of resin film.    Thermoplastic resin layer (10)    Curable resin layer (11)    Resin film (100)