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)所式之酯化合物:其中,R3係表示氫或甲基;R4係表示氫或C1-C4烷基;以及R5係表示氫或C1-C4烷基。該化合物具有優異的害蟲防治效果,因此,可用作為害蟲防治劑的活性成分。本案無圖式。