A phospholipid-like acrylamidic monomer with both a long alkyl chain as the hydrophobic group and a phosphatidylcholine analogue as the hydrophilic group was newly synthesized and characterized. The homopolymerization and copolymerization with acrylamide were carried out in the presence of a radical initiator. The obtained polymers were characterized by FT-NMR, IR, and melting points. From the X-ray diffraction measurements, the structures proposed for monomer, homopolymer, and copolymer are basically constructed from alternately stacked bilayers with hydrophilic and hydrophobic regions of the monomer or the side chain, the bilayer structures of which are similar to that found for lipid bilayers. The thermal properties of monomer and polymers were also studied by DSC measurements.