Abstract: A spout member including a base portion which is fixed to a bag body, a cylindrical portion which protrudes upward from the base portion, and a sealing portion which seals a front end of the cylindrical portion through a breakable thin portion is disposed between two sheets of film forming the bag body. A sealing chamber accommodating the cylindrical portion and the sealing portion is opened by tearing the two sheets of film along an opening assisting line. An opening assisting plate protruding to at least one of a left side and a right side of the sealing portion is disposed above the opening assisting line. A sandwiching reinforcement seal portion for reinforcing the two sheets of film by sealing inner surfaces thereof is provided between the opening assisting plate and the opening assisting line.

Abstract: It is aimed to provide a spout member and a packaging bag using the spout member which have excellent handling property and hygiene management performance at the time of supplying water or the like from the outside before and during use such as administration of water and medicine, in which a closure means for freely opening and closing an aperture formed by cutting off parts of peripheral portions of sealed film pieces is protected from a contained content at the time of storage or transportation and which have excellent protecting property even when an inner pressure acts in the packaging bag, excellent contamination preventing property until a spout is opened and excellent contamination preventing property and handling property after opening.

Abstract: A spout member including a base portion which is fixed to a bag body, a cylindrical portion which protrudes upward from the base portion, and a sealing portion which seals a front end of the cylindrical portion through a breakable thin portion is disposed between two sheets of film forming the bag body. A sealing chamber accommodating the cylindrical portion and the sealing portion is opened by tearing the two sheets of film along an opening assisting line. An opening assisting plate protruding to at least one of a left side and a right side of the sealing portion is disposed above the opening assisting line. A sandwiching reinforcement seal portion for reinforcing the two sheets of film by sealing inner surfaces thereof is provided between the opening assisting plate and the opening assisting line.