Provided is a composition for controlling pests having excellent control effect for pests and a method for controlling pests.A composition for controlling pests comprising an α-alkoxyphenylacetic acid compound and a neonicotinoid compound as active ingredients.本發明提供對於有害生物具有優異防治效果之有害生物防治用組成物以及有害生物防治方法。本發明之有害生物防治用組成物包括α-烷氧基苯基乙酸化合物與新尼古丁(neonicotinoid)化合物做為活性成分。