<p>A gas barrier film wherein a vapor deposition layer composed of an inorganic compound and a gas barrier layer are sequentially formed on at least one side of a base film which is composed of a polyester film. The gas barrier layer is formed from a mixture containing: a base material which is composed of a copolymer obtained using at least two components, namely (a) an unsaturated nitrile accounting for 10-30% by mass of the copolymer and (b) an unsaturated compound having a hydroxy group and accounting for 30-70% by mass of the copolymer, as monomers; (c) a curing agent composed of a compound having an isocyanate group; and (d) a compound having two or more carboxylic acid groups or one or more carboxylic anhydride groups.</p>
