[PROBLEM TO BE SOLVED] To provide a composite film having photo-curable property and weather resistance[MEANS FOR SOLVING] A composite film is one that includes at least a urethane polymer, wherein a Δb* value (value at an acceptance angle of 15 degrees) measured by a spectrocolorimeter after 120 hours in an accelerated weathering test and a Δb* value (value at an acceptance angle of 15 degrees) in an accelerated heat resistance test in a dark place under an atmosphere of 80° C. are both 4.0 or less. The composite film preferably has a Δb* value (value at an acceptance angle of 15 degrees) in an accelerated moist-heat resistance test in a dark place under an atmosphere of 85° C. and 85% relative humidity of 6.0 or less.