NOVELTY - An unsaturated urethane oligomer (A) is reaction product of polyol (A1), polyisocyanate compound (A2) and phosphorus atom-containing unsaturated hydroxy compound (A3). The unsaturated urethane oligomer (A) has average of 2-4 hardenable functional groups (I) per molecule, and phosphorus atom content of 0.1-5 %mass. The polyol (A1) has 2-3 hydroxyl groups per molecule and hydroxyl value of 18.5-84.2 mg potassium hydroxide/g, and does not have phosphorus atom in molecule. The unsaturated hydroxy compound (A3) has hardenable functional group (I), hydroxyl group and phosphorus atom.    USE - Unsaturated urethane oligomer is used for curable resin composition used as photocurable resin composition for manufacture of transparent laminate (all claimed) e.g. laminated glass for display device and solar-cell module.    ADVANTAGE - The laminate manufactured using the curable resin composition containing the unsaturated urethane oligomer has excellent transparency and flame retardance.    DETAILED DESCRIPTION - An unsaturated urethane oligomer (A) is reaction product of polyol (A1), polyisocyanate compound (A2) and phosphorus atom-containing unsaturated hydroxy compound (A3). The unsaturated urethane oligomer (A) has average of 2-4 hardenable functional groups of formula: CH2=C(R)C(O)O- (I) per molecule, and phosphorus atom content of 0.1-5 %mass. The polyol (A1) has 2-3 hydroxyl groups per molecule and hydroxyl value of 18.5-84.2 mg potassium hydroxide/g, and does not have phosphorus atom in molecule. The unsaturated hydroxy compound (A3) has hardenable functional group (I), hydroxyl group and phosphorus atom.    R=H or methyl.    INDEPENDENT CLAIMS are included for the following:    (1) curable resin composition (14), which contains the unsaturated urethane oligomer (A);    (2) transparent laminate, which has a pair of transparent substrates (10,16) and a layer of cured resin interposed between the transparent substrates. The cured resin is cured material of the curable resin composition; and    (3) manufacture of transparent laminate, which involves forming sealed space which accommodates the curable resin composition between the pair of transparent substrates under pressure-reduced atmosphere (A1), manufacturing lamination precursor having the pair of the transparent substrates and curable resin composition sealed between pair of transparent substrates, placing the lamination precursor under atmosphere (A2) whose pressure is more than the pressure-reduced atmosphere (A1), and hardening the curable resin composition under the atmosphere (A2).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view explaining the manufacture of laminate using the curable resin composition containing the unsaturated urethane oligomer.    Transparent substrates (10,16)    Curable resin composition (14)    Vacuum pump (28)    Suction pad (32)    Cylinder (34)