Provided is a flavoring agent that comprises a copolymer, said copolymer comprising: 10-90 mol% of a structural unit having a weight-average molecular weight f 10,000-5,000,000 and based on 2-(meth)acryloyloxyethylphosphorylcholine； and 90-10 mol% of a structural unit based on an alkyl group-containing (meth)acrylic monomer, a quaternary ammonium group-containing (meth)acrylic monomer or a (meth)acrylamide-based monomer. Also provided is a composition for oral cavity that contains the flavoring agent.本發明提供一種調味劑，其由含有下列結構單元的共聚物所構成：10~90莫耳%重均分子量為10,000~5,000,000的以2-（甲基）丙烯醯氧乙基磷酸膽鹼為基礎的結構單元；以及90~10莫耳%以含烷基的（甲基）丙烯酸類單體、含季銨基的（甲基）丙烯酸類單體或（甲基）丙烯醯胺類單體為基礎的結構單元。此外，本發明還提供一種含有所述調味劑的口腔用組合物。
