To provide a device capable of retaining the number of game media stored in hopper tanks without setting storage sensors in the hopper tanks equipped in a game machine and a game medium dispenser.

A supply conveyer 20 in this game medium supply device supplies the game media to the hopper tank 60 incorporated in the game machine 11 by the number of game media calculated as a difference between out balls and safe balls. The supply conveyer 20 supplies the game media to the hopper tank incorporated in the game medium dispenser 12 by the number of the game media put out corresponding to the amount of fed currency or according to a putout command.