To stably continue the peeling of an unnecessary sheet while the co-rising of a label is suppressed effectively.

A rolled web R comprises an adhesive sheet S in which the inside of each of a plurality of closed loop-shaped notches Cu is formed as the label L and a belt-shaped release sheet RL to one side of which the adhesive sheet S is bonded temporarily, and an adhesive sheet S region located outside each label L is made an unnecessary sheet E. A device 10 for preventing label co-rising has a receiving roller 12 for guiding the conveyance of the rolled web R and a pressing roller 13 which contacts the adhesive surface S1 side of the unnecessary sheet E and folds the unnecessary sheet E to form a folding edge SE and peels the unnecessary sheet E from the release sheet RL by holding the folding edge SE with the receiving roller 12.