To provide a method for manufacturing a packaging bag having a pouring nozzle of which the manufacturing is easy and inexpensive, and which can also be used to pour food.

Inner faces of side portions of the inside and outside films are made to a nozzle forming member 5 by being deposited by fusion with a heat seal, the outer face of the basic portion of this nozzle forming member 5 is deposited by thermal fusion on the inner face of the packaging bag body 12 in a state of lump of a release film 4 to a non-fusion depositing zone between the inside and outside films, and then, in the state from which the release film 4 is removed, the inner face of the top portion of the nozzle forming member 5 is deposited by the thermal fusion.