To obtain a gas barrier laminated film which is excellent in heat-resistant adhesiveness, that is, adhesiveness after heat treatment wherein lamination-lift does not occur in an adhesion surface of the laminated film even when high temperature and high pressure treatment specially such as retort treatment is performed, and excellent in barrier property for gas such as oxygen, water vapor specially in gas barrier property in high humidity.

The gas barrier laminated film includes a layer (Y) containing a polymer (a) composed of an unsaturated carboxylic acid compound polyvalent metal salt on at least one surface of a base material layer (X), and a solvent-based polyester is coated on the layer (Y).