An objective of the present invention is to develop a polymeric emulsifier allowing emulsion of oily ingredient without the necessity of containing any surfactant.The present invention provides a polymeric emulsifier containing methoxypolyethyleneglycol polymethacrylate.本發明開發即使不調配表面活性劑也可將油性成分乳化的高分子乳化劑。一種高分子乳化劑,其特徵在於含有甲氧基聚乙二醇聚甲基丙烯酸酯。