PURPOSE: A pesticidal composition containing ester compounds is provided to efficiently prevent pest.CONSTITUTION: A pesticidal composition contains an ester compound of chemical formula I and an ester compound of chemical formula II as an active ingredient. A method for preventing pest comprises a step of applying total effectively amount of the ester compounds to pest or pest inhabits. The pest includes harmful insects and mites.COPYRIGHT KIPO 2012하기식 (I) 로 나타낸 에스테르 화합물:및 하기식 (II) 로 나타낸 에스테르 화합물:을 활성 성분으로서 포함하는 살충 조성물로서, 해충에 대해 탁월한 방제 효과를 갖는 살충 조성물.