The present invention relates to an antifouling coating composition, an antifouling coating film, a substrate having an antifouling coating film, an antifouling substrate, a method for manufacturing a substrate having an antifouling coating film, and an antifouling method for a substrate. Dirty paint composition comprises the hydrolysis of at least one of the polymer (A1) with the structural unit shown in the following formula (1) and the polymer (A2) with the structural unit shown in the following formula (2) A polymer (A), a tertiary carboxylic acid component (B) containing a tertiary acid, and an antifouling agent component (C). In formula (1), M represents zinc or copper, R 1 independently represent a hydrogen atom or a methyl group. ‑COO‑M‑O‑COR 2 ...(2) In formula (2), M represents zinc or copper, R 2 represents an organic group.