Polyurethane composition

A polyurethane composition comprising a base resin composition and a curing agent, wherein the base resin composition comprises a compound (A-1) comprising a polyalkylene skeleton comprising neither an aromatic skeleton nor an alicyclic skeleton, and having two or more functional groups independently selected from a hydroxyl group, a carboxyl group, an amino group, an imino group or a thiol group;

• at least two different compounds (A-2), each comprising structural units derived from a diamine compound having an aromatic skeleton and/or alicyclic skeleton and structural units derived from an epoxy group;
• a blowing agent (B);
• and an amine-based catalyst (C);
• wherein in each of the at least two different compounds (A-2), a ratio of a number of the structural units derived from the epoxy group to a number of the structural units derived from the diamine compound having the aromatic skeleton or alicyclic skeleton is less than or equal to 0.8, or 5 to 20.