An ester compound represented by formula (1): wherein Q represents N(CH2C≡CH)-CH2-C*(=O) or N(CH2C≡CH)-C(CH3)=N* (where, * represents a binding position with N atom being adjacent to a carbonyl group) R3 represents a C1-C3 alkyl group and a relative configuration between the substituent at the 1-position of the cyclopropane ring and the substituent at the 3-position of the cyclopropane ring is a trans configuration, has an excellent pest control effect.一種以式(1)代表的酯化合物具有極佳的有害生物(pest)控制效果:其中Q代表N(CH2C≡CH)-CH2-C*(=O)或N(CH2C≡CH)-C(CH3)=N*(在此*代表與羰基鄰接的N原子之結合位置);R3代表C1-C4烷基;且在該環丙烷環之1-位置上的取代基與在該環丙烷環之3-位置上的取代基之間的相對組態為反式組態。
