A hair cosmetic that contains, at a specific ratio, (A) a tertiary amine compound or a salt thereof, (B) an aliphatic alcohol having 12 to 26 carbon atoms, (C) a cationic group-containing copolymer obtainable by radical polymerization of a specific nonionic group-containing vinyl monomer, a specific cationic group-containing vinyl monomer, and a specific crosslinkable vinyl monomer as essential, and water.