To set a distance of a blank part constant up to an opening end of a bag mouth from a seal part of a packing bag packed in a vacuum by a rotary vacuum packing device.

A rotary vacuum packing device packs a packing bag 22 in a vacuum by sealing the inside by putting a lid material on a table 25, by revolving the table 25 for placing the packing bag 22 around an endless track. A position correction device of the packing bag 22 on the table 25 of the rotary vacuum packing device corrects a position of the packing bag 22 transferred on the table 25, and comprises a stopper 44 having a forward inclined stopper surface 44A and provided on the table 25 for positioning the packing bag by allowing the front end bag bottom of the packing bag 22 to abut on the stopper surface 44A when the packing bag 22 transfers and a butting plate 66 provided in the rear of a seal table 51 for sealing the rear end side bag mouth of the packing bag 22 and stopping by abutting on the retreating packing bag 22 by retreating by slipping down the packing bag 22 run on the stopper surface 44A of the stopper 44.