The invention provides a coating composition for rubbers which forms a coating film having excellent adhesion to the rubber surface as well as excellent wear resistance and surface lubricity. The composition is an aqueous resin composition containing 100 parts by weight of the component (A), 10 to 100 parts by weight of the component (B) and 5 to 150 parts by weight of the component (C): wherein the component (A) is a curable silicone composition consisting of (A-1) which is an organopolysiloxane in which a group selected from the group consisting of a hydroxyl group and groups represented by the formula R1O— (R1 is a monovalent hydrocarbon group), and a group represented by the formula (1), below are bonded to each of at least two terminal silicon atoms of a polysiloxane chain: (A-2) which is an alkoxysilane and, optionally, (A-3) which is a metal compound as a condensation catalyst; component (B) which is a polyurethane resin; and component (C) which is an organic resin fine powder having a melting point of 150° C. or higher and an average particle diameter of 0.5 to 50 μm.