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Ultraviolet-curable resin composition for use in optical disks and cured products thereof

An ultraviolet-curable resin composition characterized by comprising (A) a (meth)acrylate having an aliphatic chain, particularly a C 10-25 aliphatic chain, either (B) a (meth)acrylate monomer exclusive of the (meth)acrylate (A) and the following (meth)acrylate (C) and/or (C) a urethane (meth)acrylate, and (D) a photopolymerization initiator. The ultraviolet-curable resin composition is suitable for use in the intermediate resin layer of a multilayer optical disk, and ensures high mass productivity in the formation of substrates by the 2P method. Further, the ultraviolet-curable resin composition exhibits excellent peelability from a stamper, and can provide an optical disk base which exhibits a reduced change of warpage when curing or after the resulting multilayer disk is placed under high-temperature and high-humidity conditions.