To provide a paper bag manufacturing device which has a simple structure, accurately stops a tubular body at a specified position on a carrying line as much as possible, and in addition, further increases the manufacturing efficiency of a paper bag.

For this paper bag manufacturing device 1, processing means 6 and 7 which apply a specified processing to the tubular body are inserted in a carrying line 2 having a carrying means 4 such as a belt or a chain which carries the tubular body of a paper. In the paper bag manufacturing device 1, the carrying means 4 is driven through an index mechanism 30 of which the major constituent element is a cam.