Layered gas-barrier product and packaging bag

A gas barrier laminate consisting of, in following order:

• a paper substrate;
• a first resin layer including a polyvinyl alcohol-based resin;
• a vapor-deposited layer including at least one material from among aluminum, aluminum oxide (AlOx), and silicon oxide (SiOx);
• and
• a second resin layer in direct contact with the vapor-deposited layer, the second resin layer including a polyolefin having a polar group, wherein
• a thickness of the second resin layer is 2 μm to 10 μm,
• a thickness of the paper substrate is 30 μm to 100 μm,
• a thickness of the paper substrate is 80% or more of a thickness of an entirety of the gas barrier laminate,
• the polyolefin having the polar group is a copolymer of ethylene and an unsaturated carboxylic acid,
• a content of the polyolefin in the second resin layer is 90% by mass or more,
• a thickness of the first resin layer is 1 μm to 5 μm, and
• the first resin layer is a directly applied coat on a surface of the paper substrate.