The present invention aims for providing the novel agent which has emulsifying capacity. A complex formed by bonding an amide alcohol ester and a carboxyl group-containing polymer exhibits emulsifying capacity.本發明的目的在於提供一種具有乳化能力的嶄新劑。醯胺醇酯與含羧基高分子結合而成的錯合物,發揮乳化力。