Patent ID: 8657496

Claim:
A package bag comprising: two sheets of film which form a bag body; and a spout member which is formed between the two sheets of film, wherein the spout member includes a base portion which is fixed to the 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, the base portion is fixed to the two sheets of film through a first seal portion formed by sealing inner surfaces of the two sheets of film to an outer surface of the base portion, the cylindrical portion and the sealing portion are accommodated in a sealing chamber while being sandwiched between the two sheets of film, the sealing chamber is surrounded by the first seal portion and a second seal portion formed by sealing the inner surfaces of the two sheets of film to each other in the vicinity of the cylindrical portion and the sealing portion, the sealing chamber is opened by tearing the two sheets of film along an opening assisting line having both ends located inside the second seal portion and opened along the first seal portion, and an opening assisting plate protruding to at least one of a left side and a right side of the sealing portion is provided above the opening assisting line, and sandwiching reinforcement seal portions for reinforcing the two sheets of film by sealing the inner surfaces thereof are provided between the opening assisting plate and the opening assisting line, the sandwiching reinforcement seal portions being provided above the opening assisting line so as not to overlap the opening assisting line, the opening assisting plates protruding to both left and right sides of the sealing portion are provided above the opening assisting line, the sandwiching reinforcement seal portions formed in left and right sides of the spout member are provided between the opening assisting plates and the opening assisting line, and a gap between the left and right sandwiching reinforcement seal portions is shorter than a transverse width of the opening assisting plates.