Provided is a release paper base paper that improves transparency of an adhesive label when formed into the adhesive label without using a polyolefin laminate. A coating layer 1, and a coating layer 2 are arranged in this order, the content mass ratio of broad-leaved tree pulp in the pulp used for the substrate is 50 mass perent or more, the beating degree of the pulp used for the substrate is 30 degrees SR or more, The coat layer 1 contains a resin, and the coat layer 2 contains a clay and a binder resin. None

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