To provide a packaging bag with a steam venting function, which can make an inner pressure of the packaging body generated by heating escape even when heated in a microwave oven, inside of which is prevented from staining, and which can be held with bare hands, and to provide the packaging body using the same.

In the packaging bag with a standing pouch shape wherein a sheet of a double-folded bottom body film (1) and both end edges of two sheets of surface and back main body films (2 and 3) are applied with sealings (11) on their side parts, and the lower part end edges are applied with sealing (12) on their bottom parts into a bottom shape of a ship, on both corners of the upper part of the packaging bag, sub-seal parts (13) which are faced downward from the end edge of a top part (18) and parallel to the side part seals on the insides of the side part sealings (11) and whose ends are bent at right angles in directions of the side part sealings and are overlapped with the side part sealings, are provided.