Multi-functional copolymer and a cured product of a curable resin composition

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PROBLEM TO BE SOLVED : To provide a soluble polyfunctional copolymer which has excellent optical properties, such as a high refractive index and a high light transmittance, and is improved in moldability and mold transferability, a curable resin composition containing the same, and a cured product thereof.SOLUTION : In a soluble polyfunctional copolymer, at least a part of a monofunctional aromatic compound (A) having one unsaturated double bond is a monofunctional aromatic compound (A1) represented by the general formula (1) including one or more sulfur atoms. The polyfunctional copolymer has a weight-average molecular weight from 2, 000 to 1, 000, 000, and is soluble in organic solvents such as toluene and THF. (One to three of R-Rare arylthio groups; and Ris a vinyl group-containing group.)