To provide a pest control method or a pest control agent that is applied to pest nests to allow pests to escape from the nests.SOLUTION: Provided is a pest control method, comprising applying a composition containing a component (A) of at least one fatty acid selected from fatty acids having 4 to 18 carbon atoms, or a salt thereof, and a component (B) of pyrethrin, to pest nest, and allowing the pest to escape from the nest.SELECTED DRAWING: None【課題】害虫の巣に施用し害虫を巣から逃散させる害虫駆除方法や害虫駆除剤を提供すること。【解決手段】成分（Ａ）炭素数４～１８の脂肪酸から選ばれる少なくとも１種の脂肪酸またはその塩と成分（Ｂ）ピレトリンを含有する組成物を害虫の巣に施用し、害虫を巣から逃散させることを特徴とする害虫駆除方法。【選択図】なし
