Provided is an antifouling coating composition capable of exhibiting an antifouling effect for a long period of time even in ocean water containing highly active barnacles, serpula, and other animal species, as well as hydrozoans and other coelenterates. This antifouling coating composition comprises (A) copper glass containing divalent copper, (B) metal pyrithiones, and (C) titanium oxide, wherein the metal of the metal pyrithiones is copper or zinc the composition further contains a spreading resin the content of copper in the copper glass (A) is 24-40 mol% the content of the copper glass (A), in terms of solid content, is 1-20 mass% of the solid content of the antifouling coating composition the content of the metal pyrithiones (B), in terms of solid content, is 25-150 parts by mass per 100 parts by mass of the copper glass (A) and the content of the titanium oxide (C), in terms of solid content, is 50-300 parts by mass per 100 parts by mass of the copper glass (A).本發明提供一種防污塗料組成物,其即使在藤壺或龍介蟲等動物類、水螅蟲等腔腸動物的活性較強的海域,也能夠長期發揮防污效果。根據本發明,提供一種防污塗料組成物,含有(A)含有二價銅的銅玻璃、(B)金屬吡啶硫酮類以及(C)氧化鈦,其中,所述金屬吡啶硫酮類的金屬為銅或鋅;還含有擴散用樹脂;所述銅玻璃(A)中的CuO的含量為25~40摩爾%;以固體成分換算,所述銅玻璃(A)的含量占所述防污塗料組成物的固體成分中的1~20質量%;以固體成分換算,所述金屬吡啶硫酮類(B)的含量相對於所述銅玻璃(A)100質量份為25~150質量份;以固體成分換算,所述氧化鈦(C)的含量相對於所述銅玻璃(A)100質量份為50~300質量份。
