The present invention relates to a coating composition that can form a coating film with excellent oxygen barrier properties. An object of the invention is to provide a coated article having excellent corrosion resistance using the coating composition. The present invention provides a coating composition comprising: a modified epoxy resin (A) containing a benzene diether structure represented by a specific formula (1), which is obtained by reacting diglycidyl ether (a1) with at least one phenol (a2) selected from resorcinol, hydroquinone, and catechol; and a crosslinking agent (B).