To improve polishing efficiency by variously improving a polishing sheet.

This pachinko ball lifting device is provided with a columnar body 11 where a helical groove 13 is formed on an outer peripheral surface, a columnar body rotation means, an outer cylinder 5, an introduction means for introducing pachinko balls to the helical groove, the polishing sheet 37 and a backing plate 39. Then, the backing plate is provided with one projection piece 43 projected from one side end and the other projection piece projected from the other side end and the projection pieces are locked to the outer cylinder by locking means 26, 21 and 31. By locking the polishing sheet to the outer cylinder by the locking means, position deviation between both is prevented, ball clogging by the position deviation is prevented and lifting efficiency is improved.