To solve such problem relating to a melamine formaldehyde resin that the melamine formaldehyde resin has been applied to a decorative sheet, coating material, molding material, etc., by utilizing whose excellent properties in harness, heat resistance, etc., with involving the problems that gas is evolved due to condensation at heat curing, it is hard to use for the applications required for acid resistance, etc.

The problem can be solved by using the resin composition comprising a aminotriazine compound, a (meth)acrylate prepolymer compound having a triazine ring synthesized form formaldehyde and a hydroxy(meth) acrylate, and an isocyanate compound.