[Object] to provide a water vapor barrier composition and a water vapor barrier laminate that can easily form a water vapor barrier layer composed of an organic material on a substrate such as a plastic film by coating and can exhibit higher water vapor barrier properties than those of conventional known organic compositions. [Solution] the steam barrier composition comprises a stirene-based thermoplastic resin (a) and a hydrocarbon-based wax (B). Preferably, the steam barrier composition comprises the hydrocarbon-based wax (B) in the solid content of the composition at 580 mass perent. Selected drawing: None

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