[Object] To provide a phosphorylcholine group-containing compound capable of producing a phosphorylcholine complex, and the phosphorylcholine complex, the phosphorylcholine complex being easily manufactured and suitable for use as a phosphorylcholine antigen.;[Solving Means] There are provided a phosphorylcholine group-containing compound having a structure represented by the following formula (1), and a phosphorylcholine-protein complex having a structure in which the phosphorylcholine group-containing compound and an amino acid amine site of a protein are amide bonded.;;(X represents a hydrogen atom, a monovalent cation residue, or a hydroxysuccinimide group)
