ine) segments (a/b) in component (B) is from 73/27 to 79/21.[11] The hair cosmetic composition according to any of [1] to [10], wherein R1 is an alkyl group having 1 to 6 carbon atoms in the general formula (1).[12] The hair cosmetic composition according to any of [1] to [11], wherein the content of component (A) is from 0.01 to 30 mass %, and the content of component (B) is from 0.001 to 30 mass