An ester compound represented by formula (1): wherein R1 represents R1 represents 2-propenyl or 2-propynyl 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)表示之酯化合物:其中,R1表示2-丙烯基或2-丙炔基;R3表示氫或甲基:R4表示氫或C1-C4烷基;以及R5表示氫或C1-C4烷基;該酯化合物具有優異病蟲害防治效果,因此可作為病蟲害防治劑之活性成分。