TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The refractive index difference of resin and fiber like material made of glass fiber is 0.01 or less. The refractive index difference of resin, which comprises the resin-hardened layer and overcoat layer is 0.03 or less. The resin sheet has coefficient of linear expansion of 3x10-5/degreesC or less at 25-160degreesC and light transmittance of 88% or more. The resin sheet further has a gas barrier layer.Preferred Composition: The overlayer is formed by ultraviolet curable resin which is a blend of oxetane resin and epoxy resin. The resin which comprises the resin-hardened layer is epoxy resin. EXAMPLE - Epoxy resin liquid comprising 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate of formula (3) (in wt.pts) (35.9), dicyclo pentadiene type epoxy resin EXA-7230 of formula (4) (10.1) having epoxy equivalent of 259, methyl nadic acid anhydride (52.9) as hardener, and tetra-n-butyl-phosphonium o,o-diethyl phospho dithioate of formula (5) (1.1) was prepared. The epoxy-resin liquid was impregnated into fabric like material NEA2116F S136 having refractive index 1.513, and thickness of 90 microns and maintained for 60 minutes under pressure reduction (200 Pa). Application of the toluene solution of urethane acrylate of formula (6) (17 weight%) was carried out at speed of 0.3 m/min on stainless steel endless belt. Then the coating was air-dried and toluene was volatilized, hardened and hard-coat layer with a film thickness of 2 microns was formed. The fiber-like material impregnated with the epoxy resin liquid was bonded on the hard coat layer, hardened and laminate material with film thickness of 100 microns in which hard-coat layer and the resin hardened layer were laminated, was obtained. The refractive index of the portion except the fiber-like material of the resin-hardened layer was 1.522. The refractive-index difference of the fiber-like material and the other portion was 0.009. A resin solution for overcoat layer formation was prepared using oxetane resin Aronoxetane OXT-221 (91), 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate of (3) (4.8), and light cation initiator Adeka Optomer SP-170 (4.3). Then, the laminate material of hard-coat layer and resin hardened layer was peeled from the endless belt, and maintained at oxygen concentration at 200 degrees C on glass panel by substitution by nitrogen for 1 hour, and cured. The resin solution for overcoat layer formation was coated so that thickness was 30 microns, inserted to the glass panel of thickness 5 mm, irradiated with ultraviolet-ray of 1000 mJ/cm2 irradiation amount, and the resin was hardened, and The resin sheet having overcoat layer formed on the surface layer was produced. The resin sheet had surface roughness of over coat layer of 110 nm, coefficient of linear expansion of 1.8x10-5/degreesC, light transmittance of 88% and haze of 5%, without crack.