To provide a curable resin composition for an optical disk which achieves reliable recording and reproducing while providing a cured product having excellent curability, less warpage, and sufficiently suppressed permanent deformation such as pressure welding marks or recesses, and to provide a cured product obtained by curing the resin composition, and an optical disk comprising a layer obtained by curing the resin composition.

The curable resin composition for an optical disk contains: (a) at least one kind of compounds selected from a group consisting of a urethane (meth) acrylate compound, a polyester (meth) acrylate compound, an epoxy (meth) acrylate compound, which each have two or more radical polymerizing unsaturated groups in molecule, and an oligomer or polymer having a (meth) acryloyl group in a side chain; (b) a (meth) acrylate compound containing a carboxyl group having a molecular weight of 100 to 500 other than (a); (c) a (meth) acrylate compound other than (a), (b); and (d) a photopolymerization initiator.