PROBLEM TO BE SOLVED: To provide a composition for preventing the entry of cats which can reduce damage caused by the entry of cats.SOLUTION: A composition for preventing the entry of cats contains 2-methyl-4-decanone or 2-methyl-4-undecanone as an entry preventing component.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】猫の侵入による害を軽減できる猫侵入抑制組成物を提供する。【解決手段】2-メチル-4-デカノンまたは2-メチル-4-ウンデカノンを侵入抑制成分として含有する猫侵入抑制組成物。【選択図】なし