PURPOSE: A pesticidal composition containing ester compounds is provided to efficiently prevent pests.CONSTITUTION: A pesticidal composition contains ester compounds of chemical formulas I and II as active ingredients. The weight ratio of the ester compounds is 300:1-1:300. A method for preventing pest comprises a step of applying effective amount of ester compounds to pests or pest inhabits. The pests include 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.