To provide a base paper for release paper suitable for repeated use as process release paper by preventing deterioration of surface quality of a release surface of the process release paper and deterioration of an outermost coating layer of the base paper for process release paper. An object is to provide a paper sheet comprising a paper substrate and a coating layer on at least one side of the paper substrate, wherein the outermost coating layer located outermost relative to the paper substrate in the coating layer comprises an inorganic pigment, A water-resistant agent and a water-soluble zirconium compound. None

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