To provide a packaging bag for microwave heating, which stores a food consisting of a liquid substance and a solid substance largely containing water content, oil content and sugar content inside, is heat-cooked in a business-use microwave oven with a high output, and has no possibility of making a hole in the packaging bag even if the microwave is partially concentrated to partly strongly heat the packaging bag.

The packaging bag for heating in the microwave oven comprises a laminate of a polybutylene terephthalate film and a heat adhesive resin layer, or a laminate of a biaxially oriented polyethylene terephthalate film, the polybutylene terephthalate film and the heat adhesive resin layer.