NOVELTY - An unsaturated urethane oligomer contains reaction product of polyol component, polyisocyanate compound and unsaturated hydroxy compound, and has average of 2-4 hardenable functional groups in a molecule. The unsaturated urethane oligomer has phosphorus content of 0.1-6 %mass. The polyol component comprises polyol (a1) having number of hydroxyl groups of 2-3 and phosphorus atom in a molecule, and hydroxyl value of 35-150 mg potassium hydroxide/g, polyoxyalkylene polyol obtained by reacting cyclic ether with initiator, and polyester ether polyol.    USE - Unsaturated urethane oligomer is used for curable resin composition for manufacturing transparent laminated material (all claimed). Uses include but are not limited to windshield glass, safety glass, security glass, fire-prevention safety glass, display component and component for solar cell module.    ADVANTAGE - The laminated material containing the unsaturated urethane oligomer has excellent transparency and flame retardance.    DETAILED DESCRIPTION - An unsaturated urethane oligomer contains reaction product of polyol component, polyisocyanate compound and unsaturated hydroxy compound, and has average of 2-4 hardenable functional groups in a molecule. The unsaturated urethane oligomer has phosphorus content of 0.1-6 %mass. The polyol component comprises polyol (a1) having number of hydroxyl groups of 2-3 and phosphorus atom in a molecule, and hydroxyl value of 35-150 mg potassium hydroxide/g, polyoxyalkylene polyol obtained by reacting cyclic ether with initiator having number of active hydrogen of 2, and which does not have phosphorus atom and ester bond in molecule and polyester ether polyol having number of hydroxyl groups of 2 in a molecule, hydroxyl value of 10-160 mg potassium hydroxide/g and which does not have a phosphorus atom in a molecule. The unsaturated hydroxy compound is compound having hardenable functional group of formula: CH2=C(R)C(O)O-(I) and hydroxyl group.    R=H or methyl.    INDEPENDENT CLAIMS are included for the following:    (1) curable resin composition (14), which contains unsaturated urethane oligomer;    (2) transparent laminated material; and    (3) manufacture of transparent laminated material.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the transparent laminated material.    Transparent substrates (10,16)    Double-sided adhesive tape (12)    Curable resin composition (14)    Pressure reduction chamber (26)    Vacuum pump (28)