Coating liquid and gas barrier laminate

A gas barrier laminate comprising:

• a base material;
• and
• a gas barrier layer formed on the base material and comprising a layer (A) formed from a coating liquid, and a layer (B) containing polycarboxylate polymers, each polymer of polycarboxylate polymers having two or more carboxyl groups, wherein
• the coating liquid comprises ultrafine zinc oxide particles, a polyester resin, an ammonium polycarboxylate salt, and water,
• an amount of the ultrafine zinc oxide particles is from 65 mass % to 90 mass % with respect to a solid content of the coating liquid,
• an amount of the ammonium polycarboxylate salt is from 1 mass % to 5 mass % with respect to the ultrafine zinc oxide particles, and
• the polyester resin has an acid value of 15 mg KOH/g or less, and
• the layer (A) and the layer (B) are adjacent to each other in the gas barrier layer.