To surely limit a number of winning balls, and surely keep the health of play.

A fluctuation winning device 2 comprises a mount base 15 having an opening 14, and an opening and closing member 13 mounted on the opening in such manner that it can be opened and closed. On this occasion, a flow passage in which the entered balls are conveyed, is formed on a rear side of the mount base, the passage is branched into a winning ball guide passage 23 and a residual ball guide passage 24 on the way, a downstream lower end of the residual ball guide passage is connected to a residual ball returning port 31, a count means for counting the balls entered from the opening, is mounted on the flow passage, the opening and closing member is closed when the number of balls counted by the count means reaches a specific number, and a downstream direction switching means for conveying the conveyed balls over the specific number, to the residual ball guide passage, is installed on a branch part of the winning ball guide passage and the residual ball guide passage.