The invention provides an apparatus for feeding a paper in which there are provided a stacker for placing a stack of papers and threefold cylinder for separating the lowermost paper by vacuum suction from the stack of papers placed on the stacker and sequentially feeding the separated paper one by one. The threefold cylinder is disposed below the stacker in the vicinity of the leading edge of the stacker in relation to the feeding direction. And, the threefold cylinder includes a first cylinder rotatable and provided with a number of through holes on the circumferential surface; a second cylinder, installed inside the first cylinder, provided with a slit-shaped opening on the circumferential surface; a third cylinder, installed inside the second cylinder, provided with a slit-shaped opening on the circumferential surface thereof. The third cylinder is connected to vacuum suction.