To provide an water-based resin composition suitably used as a coating, such as for an automobile, for a building material, and so on by improving not only weather resistance but also drastically improving hot-water whitening resistance, blocking resistance, and resistance to contamination, and to provide a water-based coating composition and a method for producing the water-based resin composition.

The water-based resin composition includes a polymer (A2) which is obtained by polymerizing monomer components including an oxazoline group-containing monomer (a), a reactive group-containing monomer (b), and a silane coupling agent (d) as indispensable components.