A method for producing a high-quality phosphonocrotonic acid derivative is provided. The present invention is a method for producing a compound represented by the following general formula (3) by reacting a compound represented by the following general formula (1) with a compound represented by the following general formula (2). And a treatment step using an acid or a base. [Wherein, R1 represents a linear or branched alkyl group having 1 to 6 carbon atoms which may be substituted with an aryl group having 6 to 10 carbon atoms, and R2 represents a hydrogen atom or 6 to 10 carbon atoms. Represents a linear or branched alkyl group having 1 to 6 carbon atoms which may be substituted with an aryl group, wherein R3 is a linear or branched alkyl group having 1 to 6 carbon atoms, or a carbon number having 6 to 10 carbon atoms. An aryl group or a halogen atom is represented, X represents a halogen atom, and several R1 may be the same or different. ]高品質のホスホノクロトン酸誘導体の製造方法を提供する。本発明は、下記一般式（１）で表される化合物と、下記一般式（２）で表される化合物を反応させて、下記一般式（３）で表される化合物を製造する方法であり、酸又は塩基を用いる処理工程を含むことを特徴とする。〔式中、Ｒ１は炭素数６～１０のアリール基で置換されていてもよい炭素数１～６の直鎖若しくは分岐鎖のアルキル基などを表し、Ｒ２は水素原子、又は炭素数６～１０のアリール基で置換されていてもよい炭素数１～６の直鎖又は分岐鎖のアルキル基を表し、Ｒ３は炭素数１～６の直鎖若しくは分岐鎖のアルキル基、炭素数６～１０のアリール基、又はハロゲン原子を表し、Ｘはハロゲン原子を表し、複数個のＲ１は同一又は異なっていてもよい。〕
