Provided are a gas barrier laminate, a packaging bag, and a packaging product that have sufficient gas barrier properties even after being folded. A method for producing a laminated paper, comprising: A paper substrate; a barrier layer; and an overcoat layer in this order, wherein the overcoat layer comprises a polyolefin having a carboxyl group, A gas barrier laminate comprising a resin containing a cross-linked polyolefin obtained by cross-linking with a cross-linking agent having a plurality of reactive groups that react with carboxyl groups in one molecule. Figure 1

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