Problem to be solved. To provide an adhesive label that can readily ventilate steam from various microwave heating packaging containers automatically. Solution. An adhesive label for automatic steam vent promotion for a microwave heating packaging container includes a substrate, an adhesive layer and a separator in this order. The adhesive label includes a heat-generating printing layer in part on an opposite side to the adhesive layer of the substrate or part between the substrate and the adhesive layer.

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