PROBLEM TO BE SOLVED: To provide a pest control agent capable of sufficiently obtaining a behavior-inhibiting effect against pests in a short time while having a composition having almost no adverse effect on the human body. SOLUTION: The pest controlling agent to be attached to pests is characterized by containing cis-1,1,1,4,4,4-hexafluoro-2-butene and a CFC alternative for cooling. [Selection diagram] Figure 1【課題】人体への悪影響が殆ど無い組成としながら、害虫に対する行動阻害効果を短時間で十分に得ることができる害虫防除剤を提供する。【解決手段】害虫に付着させる害虫防除剤において、cis-1,1,1,4,4,4-ヘキサフルオロ-2-ブテンと冷却用代替フロンとを含むことを特徴とする。【選択図】図1