Hard polyurethane resin composition, hard polyurethane resin, molded article, and fiber-reinforced plastic

A hard polyurethane resin composition comprises a polyisocyanate component that comprises polyphenylmethane polyisocyanate and an alicyclic polyisocyanate and a polyol component, wherein the ratio of the amount of isocyanate groups derived from the alicyclic polyisocyanate to the total amount of isocyanate groups derived from polyphenylmethane polyisocyanate and the isocyanate groups derived from the alicyclic polyisocyanate in the polyisocyanate component is 10 to 70 mol%.