Problem to be solved: To provide a gas barrier laminate and a packaging bag capable of exhibiting good gas barrier properties even after a retort treatment. [Solution] a gas barrier laminate includes a barrier layer having a base material on which a barrier coat is provided, a sealant layer overlapping the barrier layer, and an adhesive layer for bonding the barrier layer and the sealant layer. After the base material is exposed to 120 degrees Centigrade for 15 minutes, the heat shrinkage in the MD direction of the base material obtained by the following formula (1) is 1 perent or more, The hardness of the adhesive layer measured by the nanoindentation method is 0.1 MPa or more and less than 0.9 MPa. Selected drawing: Figure 1

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