Provided is a packaging bag: which does not require an outer container that is separate from the packaging bag; and for which it is not only possible to reduce cost by simplification of the manufacturing process, but also for which a film-shaped pouring nozzle does not protrude from the upper edge or the side edge of the packaging bag, making it possible to reduce storage and display space and eliminating the risk of bending, damage, etc. of the film-shaped pouring nozzle. The packaging bag is provided with a main bag body, which is made of a laminate film, and a film-shaped pouring nozzle, which is made of a laminate film that is thinner than the laminate film for the main bag body and which exhibits a self-sealing function. The main bag body is provided with a partitioned area in which at least one corner has been sectioned off and in which the pouring nozzle is fixed and held on the edge of the area. The partitioned area is detachably connected to the partitioning edge and is formed as a protective cover for storing the pouring nozzle therein. The outer surface of the base of the pouring nozzle is connected to the main bag body by being fused and bonded to the inner surface of the partitioning edge of the main bag body.