NOVELTY - A transparent-curable resin composition contains polyfunctional vinyl aromatic copolymer (20-98 weight%) and inorganic filler (2-80 weight%). The polyfunctional vinyl aromatic copolymer has structural units derived from divinyl aromatic compound and mono-vinyl aromatic compound. The polyfunctional vinyl aromatic copolymer has repeating unit (10 mol% or more) originating in divinyl aromatic compound and aromatic hydrocarbon-containing repeating unit (5 mol% or more) (1) derived from divinyl aromatic compound. The copolymer has number average molecular weight of 600-3000000.    USE - Transparent-curable resin composition for sheet used for optical sheet (both claimed) for liquid crystal display elements, color filters, organic electroluminescent display elements, solar cell, touch panel, optical element and optical waveguide. Can also be used for optical lens and light emitting diode sealing agent.    ADVANTAGE - The resin composition has excellent transparency, heat resistance, solvent resistance high strength and low water absorbability.    DETAILED DESCRIPTION - A transparent-curable resin composition contains polyfunctional vinyl aromatic copolymer (20-98 weight%) and inorganic filler (2-80 weight%). The polyfunctional vinyl aromatic copolymer has structural units derived from divinyl aromatic compound and mono-vinyl aromatic compound. The polyfunctional vinyl aromatic copolymer has repeating unit (10 mol% or more) originating in divinyl aromatic compound and aromatic hydrocarbon-containing repeating unit (5 mol% or more) of formula (1) derived from divinyl aromatic compound. The copolymer has number average molecular weight (Mn) of 600-3000000 based on polystyrene conversion, measured with gel permeation chromatography. The ratio of weight average molecular weight to number average molecular weight of copolymer is 2-100. The copolymer is a solvent soluble copolymer having alcoholic hydroxyl group and chain hydrocarbon or aromatic hydrocarbon bonded through ether bond at the terminal. The oxygen content derived from alcoholic hydroxyl group and chain hydrocarbon or aromatic hydrocarbon bonded through ether bond is 0.1-5 weight%.    R1=6-30C aromatic hydrocarbon.