leaving the base fabric of the other side being caught on the first yarn or constituting a weave structure with the first yarn and returning to the base fabric of the other side and being woven into the base fabric the fabric used for the bag body of the present invention is a woven fabric and the yarn extending from one non inflating section to another non inflating section without weaving the base fabric are used to form the restriction threads as for the restriction threads intersecting with this yarn the yarn constituting the base fabric are used the tensile strength of the thread used is preferably 30 n thread or higher a tensile strength of 40 n thread or higher is particularly preferable if the tensile strength is within this range there is no need to use an excessively large number of threads to withstand the stress during inflation and the design flexibility is not restricted the elongation percentage of the restriction thread used can be suitably 16 to 30 if the elongation percentage is within this range the stress exerted on the start point and the end point of the restriction threads does not become excessive and the inflation volume can be effectively controlled such yarn can be obtained through extrusion and hot stretching of a molten polymer and can be produced by changing the stretching conditions the stretching ratio and the stretching temperature the density of the restriction threads leaving the base fabric is suitably 0 1 to 1 5 thread cm 2 relative to the area of the bag body inflating section if the density is within this range opening of the threads at the start point and the end point of the restriction threads can.