PURPOSE: To automatically control reverse piling and accumulation by supplying tablet packaging blister back sheet or the like one by one into a reverse piling apparatus which rotates intermittently at each half rotation, and then by piling two sheets so as to pile convex parts opposite, and carrying out them in the piled status.

CONSTITUTION: Blister back sheets which are carried one by one, are advanced to the space between discs 34 and 34 by a raised rocking feed claw 21. Then discs, 34 and 34 are rotated by 180° by a gear 37, idler not shown in the drawing, a gear 35 and a shaft 33, and the sheet is held reversely in the upper side inserting groove 34a. Then the next sheet is pushed into an adjacent lower inserting groove 34b in the same way. Then the feeding claw 31 is raised and advanced into inserting grooves 34a and 34b, and at the same time, it is rockingly moved forward, and two piling sheets are pushed to an accumulation apparatus (c) through between disc 34 and 34. By such a repetition, blister back sheets can be accumulated after reversely piled automatically and certainly.