NOVELTY - A gas-barrier film has layers (A) (2) and layers (B) (3) laminated on at least single surface of a biaxially-oriented polyester film (1) containing ultraviolet absorber having transmittance in wavelength of 380 nm of 5% or less and having damage with length of 5 mm or more and largest depth of 0.5 mu m or more of 70 sample/m2 or less. The layer (A) is a crosslinked resin layer having pencil hardness of more than H and surface free energy of 45 mN/m or less. The layer (B) is silicon-containing inorganic layer having thickness of 10-1000 nm.    USE - Gas-barrier film is used for solar cell and display component element (all claimed). Uses include but are not limited to packaging of foodstuff and pharmaceutical, flat-panel television, electronic paper and organic electroluminescence display.    ADVANTAGE - The gas-barrier film has high gas-barrier property to oxygen gas and water vapor.    DETAILED DESCRIPTION - A gas-barrier film has layers (A) and layers (B) laminated on at least single surface of a biaxially-oriented polyester film containing ultraviolet absorber having transmittance in wavelength of 380 nm of 5% or less and having damage with length of 5 mm or more and largest depth of 0.5 mu m or more of 70 sample/m2 or less. The layer (A) is a crosslinked resin layer having pencil hardness of more than H and surface free energy of 45 mN/m or less. The layer (B) is silicon-containing inorganic layer having thickness of 10-1000 nm. The oligomer precipitation amount in layer (A) lamination surface after heat-processing for 30 minutes at 180 degrees C of 3 mg/m2 or less. The biaxially-oriented polyester film is a polyester film having easily bonding layer (C) at least on single surface. The layer thickness of layer (C) is 50-150 nm. The layer (C) and layer (A) are laminated sequentially, the undulation amplitude of the spectral reflection factor in measurement wavelength of 400-600 nm at side of layer (A) is 2% or less. The elongation of film longitudinal direction at 190 degrees C and width direction of 180% or more, and planeorientation coefficient (fn) in the both surface of polyester film is 0.14 or less. The elongation retention after performing aging process in environment of temperature of 120 degrees C and humidity of 100% for 36 hours is 40-100%. The linear expansion coefficient ( alpha ) which is average of linear expansion coefficient (( alpha )-MD) of longitudinal direction (MD) from 50-150 degrees C and linear expansion coefficient (( alpha )-TD) of width direction (TD) of is 22 ppm/ degrees C or less.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of gas-barrier film.    Biaxially-oriented polyester film (1)    Layes (2,3)