To suppress illegal acts using a suspended substrate and a body sensor.

The prize winning determining means of a slot machine is provided with: a reel position determining part for determining the position of a rotation reel when a stop switch is depressed (hereinafter, called as "a depress position") and/or the position of the rotation reel when it stops (hereinafter, called as "a stop position") on the basis of a signal from a reel position detection circuit for all of or a part of a plurality of rotation reels; a numerical value acquisition part for acquiring numerical values on the basis of the depress position and/or the stop position; and a combining part for combining extracted random numbers and the numerical value acquired by the numerical value acquisition part. Referring to a prize winning determination table, prize winning of the random numbers output from the combining part is determined. Since random numbers vary according to the depress position or the stop position, prediction of their prize winning becomes difficult.