Antifouling coating composition, method for forming antifouling coating layer, and method for producing ceramic building material

The present invention provides an antifouling coating composition which can be used to form an antifouling coating layer having excellent antifouling properties and hue stability. The present invention also provides a method for forming an antifouling coating layer having such characteristics, and a method for producing a ceramic building material using such a coating layer. The antifouling coating composition according to the present invention contains fine silica particles (A), a nonionic surfactant (B), and a nonionic surfactant (C), wherein the nonionic surfactant (B) is at least one selected from the group consisting of acetylenediol surfactants (b-1) and polyoxyalkylene alkyl ether surfactants (b-2), the nonionic surfactant (C) is at least one selected from the group consisting of vinyl polymer surfactants (c-1) and polyoxyalkylene fatty acid ester surfactants (c-2), and the mass ratio ((B)/(C)) of the nonionic surfactant (B) to the nonionic surfactant (C) is 5/95 to 90/10.