To keep a correct attitude of a bag during bag filling work in a bag bottom supporting and transferring device of a bag filling machine in such a way that the bag bottom is always placed on a right position on a conveyor.

An extremity end 2 of a conveyor 1 is supported by a pivoting fulcrum shaft 3 in such a way that it can be inclined in an upward or downward direction, and it is inclined downwardly under an operation of an air cylinder 4. A guide plate 5 comprised of many rollers 6 is fixed in a slant manner at the upper surface of the conveyor extremity end 2, the bag bottom segment placed on the slip guide plate 5 slips by itself and moves to a predetermined position on the conveyor.