PURPOSE: To provide a coating composition improved in abrasion, weather, solvent and water resistances by reacting a specific low-molecular star oligomer with a complete alkoxy monomeric melamine.

CONSTITUTION: A polyfunctional epoxy compound is reacted with a long chain (hydroxy) carboxylic acid (e.g. butanoic acid), and the with a cyclic ester compound (e.g. -caprolactone) as required, to obtain a low-molecular star oligomer with a molecular weight of 700-1,200, a hydroxyl value of 3-7 moles/kg resin, a weight average molecular weight to number average molecular weight ratio of 5 or less, and 6 or less ester bonds in the molecule. The star oligomer is reacted with an alkoxy monomeric melamine which has an average of 3 or more methylol groups esterified with a 1-5C monohydric alcohol for each triazine nucleus, an average degree of condensation of 2 or less, and a content of a mononuclear component of 50wt.% or more, thus obtaining a film-forming component. A coating composition is obtained by dispersing or dissolving the film-forming component in a solvent.