A gas-barrier laminate of a structure in which a first inorganic barrier layer, a water-trapping layer and a second inorganic barrier layer are provided in this order on a plastic base material, wherein: said water-trapping layer is a layer that has a moisture-absorbing matrix in which a granular moisture-absorbing agent is dispersed in a matrix of an ionic polymer, wherein a crosslinked structure has been introduced into the ionic polymer that is forming said matrix, the granular moisture-absorbing agent being capable of attaining humidity to a degree lower than that attained by the matrix; said second inorganic barrier layer has a water vapor permeability which is larger than a water vapor permeability of the first inorganic barrier layer, wherein the water vapor permeability of each of the first inorganic barrier layer and the second inorganic barrier layer is as measured according to the method of measuring the water vapor permeability in the description; an organic layer is provided between said water-trapping layer and the second inorganic barrier layer, the organic layer serving as an underlying layer for forming said second inorganic barrier layer; the ionic polymer is a cationic polymer or an anionic polymer, wherein said cationic polymer is a polymer having in the molecules thereof cationic groups that could turn into a positive electric charge in water and said anionic polymer is a polymer having in the molecules thereof anionic functional groups that could turn into a negative electric charge in water; and the percentage of water absorption measured according to JIS K-7209-1984 of the moisture-absorbing matrix is not less than 20% in an atmosphere of a humidity of 80%RH and a temperature of 30°C. said water-trapping layer is a layer that has a moisture-absorbing matrix in which a granular moisture-absorbing agent is dispersed in a matrix of an ionic polymer, wherein a crosslinked structure has been introduced into the ionic polymer that is forming said matrix, the granular moisture-absorbing agent being capable of attaining humidity to a degree lower than that attained by the matrix; said second inorganic barrier layer has a water vapor permeability which is larger than a water vapor permeability of the first inorganic barrier layer, wherein the water vapor permeability of each of the first inorganic barrier layer and the second inorganic barrier layer is as measured according to the method of measuring the water vapor permeability in the description; an organic layer is provided between said water-trapping layer and the second inorganic barrier layer, the organic layer serving as an underlying layer for forming said second inorganic barrier layer; the ionic polymer is a cationic polymer or an anionic polymer, wherein said cationic polymer is a polymer having in the molecules thereof cationic groups that could turn into a positive electric charge in water and said anionic polymer is a polymer having in the molecules thereof anionic functional groups that could turn into a negative electric charge in water; and the percentage of water absorption measured according to JIS K-7209-1984 of the moisture-absorbing matrix is not less than 20% in an atmosphere of a humidity of 80%RH and a temperature of 30°C.