To provide an aqueous polyurethane resin composition for forming coating films and molded articles of a polyurethane resin excellent in not only environmental pollution control but also safety such as industrial hygiene, suitable for paint, adhesive, binder, coating agent, etc., having excellent corrosion resistance and developing abrasion resistance, adhesiveness, non-tackiness and rubber elasticity.

There are provided a urethane prepolymer composition for aqueous polyurethane resin composition containing an organosilica sol produced by using an inert organic solvent free from a hydroxyl group as a dispersion solvent, and an aqueous polyurethane resin composition produced by dispersing the urethane prepolymer composition in water. The silica introduced by the organosilica sol is present in the solid component of the urethane prepolymer composition in an amount of 5-40 mass%.