In a package bag having a package bag body formed by joining laminate films each including a base film layer and a sealant layer through fusion of the opposed sealant layers and a film-shaped pouring nozzle having a self-sealing function formed by fusion-joining laminate films each including front and rear sealant layers sandwiching a base film layer at their peripheral portions other than base end portions wherein the base end portion of the film-shaped pouring nozzle is fusion-joined to a top of the package bag body, the film-shaped pouring nozzle is constructed with an inclined part located at a side of the base end portion so as to protrude from an upper end portion of the package bag body obliquely upward in a direction of a side portion thereof and a horizontal part connected to a side of a free end portion of the inclined part.