Antifouling coating material composition, antifouling coating film, substrate provided with antifouling coating film and production method therefor, and antifouling method

An antifouling coating composition comprising:

• a hydrolyzable polymer (A) comprising a metal ester group,
• zinc oxide (B),
• medetomidine (C), and
• an organic antifouling agent (D);
• and
• having a content of the zinc oxide (B) in a solid content of the antifouling coating composition of 27 to 51.9% by mass,
• having a content of medetomidine (C) in a solid content of the antifouling coating composition of 0.07 to 0.61% by mass,
• having a content of the organic antifouling agent (D) in a solid content of the antifouling coating composition of 7.4 to 15.3% by mass, and
• wherein the hydrolyzable polymer (A) comprises at least one selected from the group consisting of a polymer (A1′) having a constituent unit derived from a polymerizable compound represented by the following formula (1-1′) and a polymer (A2′) having a constituent unit derived from a polymerizable compound represented by the following formula (1-2′):
• wherein R12 each independently represent a hydrogen atom or a methyl group;
• and M represents copper or zinc,
• wherein R23 represents a hydrogen atom or a methyl group;
• R24 represents a monovalent organic group having 1 to 30 carbon atoms containing no terminal ethylenically unsaturated group;
• and M represents copper or zinc, and
• wherein the organic antifouling agent (D) is a copper pyrithione.