PROBLEM TO BE SOLVED: To provide a bactericide composition having high bactericidal effect even when containing an anionic surfactant.SOLUTION: This invention is a bactericide composition comprising: (A) a quaternary ammonium salt represented by formula (1) and the like and (B) an anion surfactant including at least one group selected from sulfuric acid ester salts and sulfonic acid salts. [Rrepresents a C9-11 aliphatic hydrocarbon group Rand Reach independently represent a C1-3 alkyl group or a C1-3 hydroxyalkyl group Ris a C1-3 alkyl group, a C1-3 hydroxyalkyl group or a benzyl group Xis a negative ion.]SELECTED DRAWING: None【課題】アニオン界面活性剤を含有しても、殺菌効果が高い殺菌剤組成物を提供する。【解決手段】(A)式(1)等で表される第4級アンモニウム塩、並びに、(B)硫酸エステル塩及びスルホン酸塩から選ばれる1種以上の基を有するアニオン界面活性剤を含有する殺菌剤組成物。〔R11はC9~11の脂肪族炭化水素基;R12及びR13は夫々独立にC1~3のアルキル基又はC1~3のヒドロキシアルキル基;R14はC1~3のアルキル基、C1~3のヒドロキシアルキル基又はベンジル基;X-は陰イオン〕【選択図】なし
