To provide a packaging film and a packaging bag using the packaging film capable of heating in a microwave oven being kept in a sealed state without forming holes in the film or the like beforehand.

In a packaging film 10, a sealant layer 12 is laminated on the most inner face of a base material film 11. The sealant layer comprises a film which is formed by an inflation method from a mixture provided by adding a thermal plastic resin 32 having a higher softening temperature than that of a polyethylene resin to the polyethylene resin 31. The polyethylene resin is preferable for the thermal plastic resin 32.