The present invention is applicable to an aluminum fin member of a heat exchanger of an air conditioner, has a sterilizing effect, has good coating property (wetting property) to the member, and is a film formed after coating. Provides an antibacterial coating agent composition and an antibacterial coating film that are thin and excellent in adhesion to members and can maintain an antibacterial and antifungal effect over a long period of time. [MEANS FOR SOLVING PROBLEMS] (A) Water-based urethane resin, (B) hydrophilic oil repellent, (C) isothiazoline-based compound as essential components, and is selected from isothiazoline-based compounds, thiazole-based compounds, benzimidazole-based compounds, and inorganic antibacterial agents It is an antimicrobial coating agent composition characterized by containing 1 type, or 2 or more types of antimicrobial agents, and an antimicrobial coating film obtained by apply coating it. [Selection] Figure 2【課題】空調機器の熱交換器のアルミニウム製フィン部材に対しても適用可能であり、除菌効果があり、部材に対する塗布性（濡れ性）が良好であり、しかも、塗布後に形成される被膜は薄膜で部材への密着性に優れており、長期間に亘って抗菌防カビ効果が維持されうる抗菌性コーティング剤組成物及び抗菌性塗膜を提供する。【解決手段】（Ａ）水系ウレタン樹脂、（Ｂ）親水撥油剤、（Ｃ）イソチアゾリン系化合物を必須成分として含み、イソチアゾリン系化合物、チアゾール系化合物、ベンゾイミダゾール系化合物及び無機系抗菌剤から選ばれる１種または２種以上の抗菌剤を含有することを特徴とする抗菌性コーティング剤組成物、それを塗布することで得られる抗菌性塗膜である。【選択図】図２
