Provided is a microwave oven-use packaging bag that can easily be torn and open even after being heated in a microwave oven. According to the present invention, provided is a microwave oven-use packaging bag in which a flexible film is formed in a bag shape. The film is constituted by layering, in the given order, a first base layer, a second base layer, and a sealant layer, with an adhesive layer interposed between each of the foregoing. The packaging bag comprises a peripheral surface section that constitutes a peripheral plane of the bag shape. The peripheral surface section is provided with an opening section for tearing the peripheral surface section so as to open the packaging bag. Processing for easy tearing has been applied to the entirety of the second base layer and a part of the sealant layer in the opening section.

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