A supply apparatus for paper of which one side is printed and another side is not printed and which is used for a single-side printer much cheaper than a double-side printer and having a smaller occupied area than that of the double-side printer is improved to be easily, promptly, safely, and surely set.A supply apparatus reverses a plurality of sheets of stacked paper of which one side has been printed so that a non-printed surface comes to an upper surface and supplies the stacked paper to a printer again. The non-printed paper supply apparatus for the single-side printer includes two palettes which sandwich and hold the stacked paper from upper and lower sides, a plurality of alignment holding tools which is provided between the palettes and is adjusted according to a volume of the stacked paper, a pair of fastening and reversing tools including reversing bars in which reversing shafts for reverse are formed on sides of the palettes opposite to each other, and a pair of reverse assisting stands which pivotally support reversing shafts of each fastening and reversing tool. The alignment holding tool and the fastening and reversing tool are respectively fixed to upper/lower palettes with fixing tools which are attached/detached in a single operation.