An ester compound represented by formula (1): wherein R3 represents hydrogen or methyl, R4 represents hydrogen or C1-C4 alkyl, and R5 represents hydrogen or C1-C4 alkyl has an excellent pest control effect and is therefore useful as an active ingredient of a pest control agent.一種式(1)所表示之酯化合物:其中R3表示氫或甲基,R4表示氫或C1至C4烷基,以及R5表示氫或C1至C4烷基;該化合物具有優異的害蟲防治效果,因此其係適用作為害蟲防治劑之活性成分。