Problem to be solved. To provide a packaging bag which can be heated with a microwave oven in a self-standing state and can easily and surely be filled with a storage object. Solution. A packaging bag 100 of a standing pouch type has a storing part 1, and a wing part 2 which is protrusively provided at a front side of the storing part 1. The wing part 2 has: an upper wing sheet part 21 and a lower wing sheet part 22 projected from a front sheet 11; a wing seal part 23 which bonds the upper wing sheet part 21 to the lower wing sheet part 22; a communication part 24 which communicates with the storing part 1 and is sealed with the wing seal part 23; a steam passage part 25 which is formed as a part of the wing seal part 23 and peeled away at...

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