(1-Methylpiperidin-4-yl)diphenylmethyl methacrylate produced an optically active, helical polymer with a highly isotactic configuration by asymmetric anionic polymerization. The optical activity of the polymer was based on the excess helical sense of the main chain. The monomer also afforded an optically active, helical polymer by the radical polymerization of (-)-menthol as a chiral additive.