To provide an unwinding preventive device for an upper winding part for preventing unwinding of the upper winding part of preceding winding during a reel change, in the reel change for forming a roll by winding paper manufactured by a paper machine on a reel spool.

A shower pipe 5 of arranging nozzles 6 for injecting shower water W toward an outer peripheral surface in the proper number along the paper width direction, is arranged in a position facing the outer peripheral surface of the completed roll R under a reel drum 3. When performing the reel change by completing the roll R, when injecting the shower water W to the outer peripheral surface of the roll R from the nozzles 6, a surface of the roll R is wetted, and since air does not infiltrate when the superimposed paper is brought into close contact with each other, the unwinding of the upper winding part is prevented.