PURPOSE: An insecticidal composition containing ester compounds is provided to ensure excellent insecticidal composition.CONSTITUTION: An insecticidal composition contains ester compounds of chemical formula I and ester compounds of chemical formula II as an active ingredient. The weight ratio of the ester compounds is 50:1-1:50. A method for preventing pest comprises a step of applying effective amount of the compounds.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.