To provide an attaching structure of a driving source of a bag-making filling packaging machine capable of easily attaching and removing the driving source used in the bag-making filling packaging machine by one person.SOLUTION: A driving source side upper attaching surface 6412 is fitted to a lower surface of a frame side first horizontal attaching plate portion 6002, and a male screw of a bolt B0 inserted into an inner part of a bolt insertion groove 62 from above is screwed into a female screw S0 so that a driving source side attaching member 64 is detachably attached at one of a plurality of locations of a frame side attaching member 60.SELECTED DRAWING: Figure 8

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