Coating composition, coating film, and method for producing coating film

A coating composition comprising

• (A) a fluorine-containing ethylenic polymer having at least one of functional group selected from the group consisting of hydroxyl, carboxyl, a carboxylic salt group and epoxy,
• (B-1) a metal oxide sol, and
• (C) a solvent;
• said fluorine-containing ethylenic polymer (A) having functional group being obtained by copolymerizing
• (a) 0.05 to 50% by mole of at least one of fluorine-containing ethylenic monomers having functional group and represented by the formula (1):
• CX2═CX1—Rf—Y (1)
• wherein Y is —CH2OH, —COOH, a carboxylic salt group, a carboxylic ester group or epoxy, X and X1 are the same or different and each is hydrogen atom or fluorine atom, Rf is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms or a divalent fluorine-containing alkylene group having ether bond and 1 to 40 carbon atoms, and (b) 50 to 99.95% by mole of at least one of fluorine-containing ethylenic monomers copolymerizable with the fluorine-containing ethylenic monomer (a) having functional group.