To provide heat seal paper having excellent visibility of contents when used as a packaging bag and having good heat sealability.SOLUTION: There is provided heat seal paper with a heat seal layer on at least one side of a paper substrate, in which a total light transmittance measured in accordance with JIS K 7361-1:1997 is 65 percent or more, and an arithmetic mean height of a surface on the heat seal layer side measured in accordance with JIS B 0601:2001 is 75 micro m or less.SELECTED DRAWING: None

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