PROBLEM TO BE SOLVED: To provide an antibacterial detergent composition for a dishwasher which has excellent washing property, is excellent in reattachment prevention property of dirt to tableware, suppresses occurrence of pink slime in the dishwasher, and achieves both washing and sanitation in the dishwasher.SOLUTION: The antibacterial detergent composition for a dishwasher is provided that contains the following components (A) to (D) at the following ratio based on the whole detergent composition, and exhibits antibacterial activity. (A) 0.01-2 mass% of dioctyldimethylammonium salt, (B) 5-50 mass% of an alkali agent, (C) 5-30 mass% of a chelate agent, and (D) 0.1-10 mass% of a scale inhibitor.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】優れた洗浄性を有し、食器類への汚れの再付着防止性に優れるとともに、食器洗浄機庫内のピンクスライムの発生を抑制し、洗浄と庫内の衛生とを両立する、食器洗浄機用抗菌洗浄剤組成物を提供する。【解決手段】下記の(A)~(D)成分を、洗浄剤組成物全体に対し下記の割合で含有するとともに、抗菌活性を示すことを特徴とする食器洗浄機用抗菌洗浄剤組成物。(A)ジオクチルジメチルアンモニウム塩 0.01~2質量%。(B)アルカリ剤 5~50質量%。(C)キレート剤 5~30質量%。(D)スケール防止剤 0.1~10質量%。【選択図】なし