To provide a heat seal paper that has a high heat seal peeling strength, is excellent in impact resistance property when used as a packaging bag, and, furthermore, is excellent in pulp recovery rate after re-disintegration.SOLUTION: Provided is a heat seal paper, which is a heat seal paper that has a heat seal layer containing a water-dispersible resin binder on at least one surface of a paper substrate, and in which the paper substrate is a non-bleached kraft paper having a basis weight of 110 grams per square metre or more, and the coating amount of the heat seal layer is 7 grams per square metre or more.SELECTED DRAWING: None
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