Abstract: Coating compositions comprising 100 parts by weight of a mixture composed of 50-98% by weight of at least one multifunctional monomer selected from compounds having 3 or more acryloyloxy groups and/or methacryloxy groups in 1 molecule, and 2-50% by weight of a bifunctional oligomer represented by the following general formula ##STR1## wherein R.sub.1 represents hydrogen or methyl, and n is an integer of 1 through 5, 0.01-10 parts by weight and polymerization inhibitor 10 through 2,000 ppm of a polymerization inhibitor, and being capable of forming a bridge hardened film of superior abrasion resistance, etc. by the application of activation energy rays, and resin moldings using the coating compositions.