To provide a game medium replenishing device which is made compact as a whole by simplifying the constitution of the game medium replenishing device for game machine and game medium renting machines in the lines of the game machines constituting a game island.

In the game medium replenishing device 6 provided at the upper part of the game machine island 1 consisting of the two lines of the game machines 11 and having a replenishing conveyer 5 for replenishing game medium for the game machines 2 and the game medium renting machines 3 in the respective lines by switching to the right and left, a vertically moving flapper 8 is provided at a position opposing each machine 2 or each machine 3 over the conveyer 5. When the flapper 8 is moved down during the forward rotation of the conveyer 5, the game mediums on the replenishing conveyer are guided to one of the right and left sides to be replenished to the machines 2 or the machine 3. After the conveyer is forward rotated and the game mediums on the conveyer pass through the position of the flapper 8, the flapper 8 is moved down and the conveyer 5 is reversed to switch and guide the mediums to the other side to replenish them to the machine 2 and the machine 3.