To reduce burden such as seal leak management of a stopper part or the like without decreasing production efficiency of container manufacturers and manufacturers using the container.

Two or more bag parts 10 are provided with rectangular packaging material 11 lapped in two thickness, stoppers 12 inserted to the upper edge of the lapped packaging material 11, an upper crosswise seal part 13 for sealing the upper edge of the packaging material 11 in conjunction with the stoppers 12, a pair of lengthwise seal parts 14 for sealing side edges of the packaging material 11 from both ends of the upper crosswise seal part 13, and a lower crosswise seal part 15 for sealing the lower edge of the packaging material 11. The bag parts 10 are the band of continuous length continuously arranged in one direction with the lengthwise seal parts 14 therebetween, and sewing lines 16 for separating adjacent bag parts 10 are formed on the lengthwise seal parts 14.