Abstract: A composition forming coated films having an excellent chipping resistance, containing:A. at least one polyester resin derived from (1) at least one acid component selected from the group consisting of dibasic acids and derivatives thereof and (2) at least one alcohol component selected from the group consisting of polyhydric alcohols and derivatives thereof; andB. at least one aminoplast resin having a number-average molecular weight of 800 to 1400,The polyester resin containing at least 20% by weight of the acid component being an aliphatic dibasic acid having 4 to 10 carbon atoms and at least 20% by weight of the alcohol component being a dihydric alcohol having 2 to 6 carbon atoms, the polyester resin having a number-average molecular weight of 2000 to 4000, a hydroxyl number of 30 to 75 and an acid number of 5 to 15.The weight ratio of the polyester resin to the aminoplast resin is 60/40 to 95/5.