Thermosetting coating composition and coated article

A thermosetting coating composition, comprising:

• a hydroxyl group-containing resin;
• a curing agent;
• a phosphazene compound;
• and
• a solvent, the hydroxyl group-containing resin is a resin that can be crosslinked with the curing agent,
• wherein the curing agent is a polyisocyanate curing agent and/or a blocked polyisocyanate curing agent,
• the phosphazene compound acts as a strong base catalyst for the crosslinking reaction, and
• the phosphazene compound contains a hydroxyl group,
• the phosphazene compound having one or more organic groups in one molecule represented by the following general formula (1)
• wherein, in the general formula (1), ** represents a bond,
• X represents a divalent organic group having 1 to 18 carbon atoms,
• R1 represents a hydrogen atom or an organic group having 1 to 18 carbon atoms,
• A1, A2, and A3 each represent a monovalent organic group,
• A1, A2, and A3 each contain at least one nitrogen atom,
• a phosphorus atom adjacent to A1, A2, and A3 and a nitrogen atom in the organic group represented by A1 are singly bonded,
• the phosphorus atom adjacent to A1, A2, and A3 and a nitrogen atom in the organic group represented by A2 are singly bonded, and
• the phosphorus atom adjacent to A1, A2, and A3 and a nitrogen atom in the organic group represented by A3 are singly bonded.