PURPOSE: To eliminate a troublesomeness to purchase a pre-paid card, for persons who use a pinball machine hall by making them receive the pre-paid card as a prize.

CONSTITUTION: A game medium-counting device is equipped with a game ball input part 1 in which pachinko balls are input, pachinko ball-counting unit which counts the number of the input pachinko balls, card storage part 7 in which pre-paid card are stored, card exchange button 6 which indicates the discharging of a pre-paid card, and control unit which makes a display unit 2 display the number of pachinko balls being counted by the pachinko ball- counting unit, makes a card discharge port 8 discharge the pre-paid card, and makes a residual pachinko ball discharge port 5 discharge residual pachinko balls after subtracting the number of pachinko balls to be equivalent to the pre-paid card from the counted number of pachinko balls.