PROBLEM TO BE SOLVED: To provide a light-diffusing adhesive layer and a light-diffusing adhesive film using the layer, which is an optical member to be used for replacement of a conventional light-diffusing plate, which has a function of a light-diffusing sheet, and which can decrease thickness of a display.SOLUTION: The light-diffusing adhesive layer has a light-diffusing function and is formed from an adhesive composition comprising the following copolymer, a crosslinking agent, and silicon-based particles. The copolymer comprises: at least one alkyl (meth)acrylate monomer having 1 to 14 carbon atoms in an alkyl group; and at least one monomer having a copolymerizable functional group selected from a copolymerizable monomer having a hydroxyl group, a vinyl monomer having a nitrogen atom, and a monomer having an aromatic group. The light-diffusing adhesive layer has a transmittance of 90 percent or more, a haze value of 40 percent or more, a refractive index of...

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