[Problem] To provide a composite film having light-curing property and weather resistance.[Means for solving] A composite film is one that comprises at least a urethane polymer, wherein both an initial b* value of the composite film measured by a spectrocolorimeter (value at an angle of 15 degrees) and a b* value after performing an accelerated weathering test for 120 hours (value at an angle of 15 degrees) are 4.0 or less, and a non-volatile component after heating the composite film at 130° C. for two hours is 96% or more.