A bag supplying apparatus for a bag-filling packaging machine, including a vibrating feeder that involves a trough in which bags are placed in a cascade fashion and a vibration driver which vibrates the trough so as to cause the bags to be conveyed forward, a positioning stopper provided at a final end of a conveying path of the bags so that the tip end of a leading bag being conveyed comes into contact with the stopper, and a suction disk that suction-chucks and lifts a bag positioned by the position stopper and feeds the bag to another location.