To provide an aqueous resin composition which has improved weatherability, also has significantly improved resistance to hot water whitening, blocking resistance and resistance to stain, and is therefore suitably used as a coating material for automobiles, construction materials, etc., and to provide an aqueous coating material composition and a method for producing the aqueous resin composition.

The aqueous resin composition is provided which contains a polymer (A0) obtained by the polymerization of monomer components essentially comprising an oxazoline group-containing monomer (a) and a reactive group-containing monomer (b). The polymer (A0) comprises two or more kinds of polymers each having different Tg.