PROBLEM TO BE SOLVED: To provide a cleaning bactericidal agent composition excellent in stability while maintaining high detergency and sterilization force, and hardly remaining an agent.SOLUTION: There is provided a cleaning bactericidal agent composition containing quaternary ammonium salt represented by the following general formula (1), an ampholytic surfactant, and polyoxyethylene oxypropylene alkyl ether, and having a weight ratio of the quaternary ammonium salt and polyoxyethylene oxypropylene alkyl ether of 1:0.3 to 1:0.9, and pH of 1 wt.% solution of 3.8 to 6.5, excluding iodine molecules. In the formula, R1, R2 are same or different saturated or unsaturated alkyl group having 8 to 18 carbon atoms； R3 is a saturated or unsaturated alkyl group having 1 to 4 carbon atoms or -[(CH2)2-O]n-R5 (n=1 to 20)； R4 is a saturated or unsaturated alkyl group having 1 to 4 carbon atoms； R5 is hydrogen or phenyl which is optionally substituted； X- is a monovalent counter ion of inorganic acid or organic acid, excluding hydrochloride.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】高い洗浄力および除菌力を維持しつつ、安定性に優れ、薬剤が残留しにくい洗浄除菌剤組成物を提供する。【解決手段】下記一般式（１）で示される第四級アンモニウム塩、両性界面活性剤およびポリオキシエチレンオキシプロピレンアルキルエーテルを含有し、第四級アンモニウム塩とポリオキシエチレンオキシプロピレンアルキルエーテルの重量比が１：０．３～１：０．９であり、１重量％水溶液のｐＨが３．８～６．５である洗浄除菌剤組成物（但しヨウ素分子は含まない）。［式中、Ｒ１、Ｒ２は同一または異なる炭素数８～１８の飽和または不飽和のアルキル基；Ｒ３は炭素数１～４の飽和または不飽和のアルキル基または－［（ＣＨ２）２－Ｏ］ｎ－Ｒ５（ｎ＝１～２０）；Ｒ４は炭素数１～４の飽和または不飽和のアルキル基；Ｒ５は水素又は任意に置換されたフェニル；Ｘ－は無機酸または有機酸の一価の対イオン（但し塩酸塩を除く）］【選択図】なし
