Gas barrier laminate and packaging body using the same

A gas barrier laminate, comprising:

• a substrate consisting of PET/AIO, PET, paper, or paper/AIO;
• a gas barrier layer on the substrate;
• and
• a sealing layer on the gas barrier layer,
• wherein
• the gas barrier layer is a layer formed by applying and heat-drying a coating solution containing 70 to 95 wt % of polyvinyl alcohol relative to a total mass of a solid content in the coating solution and 5 to 30 wt % relative to the total mass of the solid content in the coating solution of at least one metal alkoxide selected from the group consisting of tetraethoxysilane, methyltrimethoxysilane, 1,3,5-tris(3-trialkoxysilylalkyl) isocyanurate, and hydrolyzates thereof,
• the sealing layer is formed from an aqueous heat seal varnish comprising an aqueous polyolefin resin,
• a heat sealing strength of the sealing layer is 4.2-6.8 N/15 mm, determined at a 90° peel angle and a peeling rate of 300 mm/min, and
• a ratio of a water vapor transmission rate of the laminate at 40° C. and 90% relative humidity after deformation with a 600 g roll at a speed of 300 mm/min in a folded configuration with the sealing layer facing outward to a water vapor transmission rate of the laminate at 40° C. and 90% relative humidity before the deformation is 1.1 to 8.0.