A liquid film cleavage agent in which the spreading coefficient relative to a liquid having a surface tension of 50 mN/m is 15 mN/m or greater, and the aqueous solubility is 0 g to 0.025 g inclusive.本發明之液膜開裂劑對表面張力為50mN/m之液體的擴張係數為15mN/m以上,且水溶解度為0g以上且0.025g以下。