To provide a heat seal paper that is excellent in heat seal property and anti-blocking property, and, furthermore, is excellent in pulp recovery rate after re-disintegration, as well as from which a packaging bag excellent in air sealing property can be obtained.SOLUTION: Provided is a heat seal paper, which is a heat seal paper that has a heat seal layer on at least one surface of a paper substrate, and in which the heat seal layer contains a pigment having an aspect ratio of 20 or more by 15 pts.mass or more to 60 pts.mass or less for 100 pts.mass of a water-dispersible resin binder, and the Ouken-based air permeability resistance degree of the heat seal paper is 75,000 seconds or more.SELECTED DRAWING: None

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