To provide a new optically-active monomer, capable of expecting an excellent optical property, and a polymer thereof, and to provide a separating agent composed of this polymer and a separation method of an optically active material using this separating agent.

The new optically-active polyacrylamide macromonomer by general formula (1) (In the formula, R1 is a methyl group or an alkoxycarbonyl group, R2 is a phenyl group, a naphthyl group or a benzyl group, m is a number of 2-5,000, and the mark of * is an optically active carbon), the polymer thereof, the separating agent, composed of this polymer, of the optically active material, and the separation method of the optically active material using this separating agent, are provided.