To continuously and stably feed support papers for box making, etc., to a box making machine, etc., sheet by sheet by providing an air blowing means in order to feed air into a gap between adjacent leaf papers of the support paper, from the side surface of stacked bodies of the support papers, which are arranged in a row.

A hopper is constituted of a frame body 1 and a bottom plate 2, and support papers 3 are loaded on the hopper by standing them in a row, and are supported by a pusher 5. Also, a suction pad 6 being provided on the opposite side of the pusher 5, is fixed on a movable rod 7, and the movable rod 7 is pressed in the direction to the frame body 1 by a pressing rod 8. The pressing rod 8 presses the suction pad 6 to the support paper 3, and after holding the support paper 3 by suction, rotates in the left direction of the paper surface, and stands by. Then, the support paper 3 is taken out from an engaging piece 12 at a take-out port 11 by the operation of gripping arms 93, 94, etc., but in this case, air is fed into a gap between leaf papers of the support papers 3 on the hopper, from the jetting port 101 of an air knife 10, and by doing so, the frictional resistance between the support papers 3 is drastically reduced, and mistakes in the taking out of the support papers 3 are prevented from happening.