To provide a (meth)acrylate resin having a high refractive index in a cured article as an organic optical material and being also excellent in heat-resistance and moisture-resistance in the cured article, a curable resin composition, its cured article, and a plastic lens.

The curable resin composition includes a polymerizable compound (A) having a bi-naphthalene skeleton and a radical polymerizable unsaturated bond, zirconia particles (B) having a primary particle diameter of 10-100 nm, and a radical polymerization initiator (C). The curable resin composition is cured by heating or irradiation with an active energy ray.

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