To provide an adhesive composition having low water vapor permeability in spite of being an adhesive composition containing only an acrylic monomer having a general structure, and capable of obtaining an adhesive layer excellent in a water vapor barrier property, and to provide an adhesive film using the same.SOLUTION: An adhesive composition contains an acrylic polymer obtained by copolymerizing only (meth)acrylate as the monomer component, and (C) a cross-linking agent. When a thickness of an adhesive layer made by cross-linking the adhesive composition is 25 micro m, water vapor permeability of the adhesive layer is 100 g/(m2 day) or less in a 32 degrees Cx90 percent RH atmosphere when being measured by using an infrared sensor method in accordance with JIS K7129.SELECTED DRAWING: None

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