A water barrier laminate (11) including a plastic base material (1) that faces the atmosphere of a high water content, as well as a first inorganic barrier layer (3), a water-trapping layer (5) and a second inorganic barrier layer (7) formed in this order on the plastic base material (1) on the side that does not face the atmosphere of the high water content, wherein an auxiliary water-trapping layer (10) is formed on the second inorganic barrier layer (7) on the side opposite to the water-trapping layer (5) to trap the water from the side surface, the auxiliary water-trapping layer (10) being located on the surface that faces the atmosphere of a low water content or being located in a region at a distance of not more than 20 μm from the surface that faces the atmosphere of the low water content.