Reducing the amount of plastic used, and having good heat seal strength even in heat seal of a heat seal layer surface and a base paper surface at a low temperature. A heat-sealing sheet comprising a heat-sealing layer comprising at least one selected from the group consisting of an ionomer, an ethylene-based copolymer, a thermoplastic urethane, a polyvinylidene chloride, a polylactic acid, and a polybutylene succinate on one side of a base paper, Wherein the heat seal layer has an adhesion auxiliary layer formed by applying a polyethylene imine to the other surface of the base paper, and a coefficient of static friction measured by overlapping the heat seal layer surface and the adhesion auxiliary layer surface is 0.20 or more. Figure 2

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