There are provided a
gas barrier film, which can undergo winding
processing, is less likely to cause elongation or deflection upon
exposure to heat or the like during
processing or use, has a high level of dimensional stability, is less likely to be attacked by chemicals or the like during
processing or use, can form a stable
gas barrier layer, and has a high level of
gas barrier properties against
water vapor,
oxygen and the like, and a display substrate and a display using said gas barrier film. The gas barrier film comprises: a base material film 11 having a deflection temperature under load of 150° C. or above; and at least a gas
barrier layer 13A and a
smoothing layer 15A in that order, or a
smoothing layer 15A and a gas
barrier layer 13A in that order provided on the base material film 11. Preferably, the base material film 11 is
polyethylene naphthalate, the gas
barrier layer 13A is formed of an
inorganic oxide, an inorganic oxynitride, an inorganic oxycarbide, or an inorganic oxycarbonitride, and the
smoothing layer 15A formed of a cardo
polymer,
sol-gel, or a material containing an acryl structure.