A biaxially stretched, blow molded container obtained by molding a laminated test tube shaped preform molded by an injection molding process. The container has a neck, a body, and a bottom, and having an outer shell and an inner bag to be laminated in a peelable manner with an outer layer inner surface. The inner bag can be deflated under a pressure drop therein. The outer layer and an inner layer have a laminar structure in which the lamination extends from a predetermined position of the neck to a lower end face. The layers are peeled from each other, starting from a lamination interface between the layers. This interface is exposed outside at the lower end face of the gate mark and can be used as an air intake vent that enables outside air to be taken into the space between layers.