To provide an automatic shutter smoothly opening/closing an opening/closing door in the automatic shutter provided in a game ball inflow part of a game ball lift.

The automatic shutter 64 is so formed that the opening/closing door 64-6 is attached to a connecting rod 64-4 via a support member 64-5 and the opening/closing door vertically moves by rotating a crank roller 64-3 by a motor. The opening/closing door 64-6 is supported to columnar shaft parts 64-7a and 64-7b into an erected state, the shaft parts 64-7a and 64-7b are rotatably provided and made of nylon to extremely smoothly open/close the opening/closing door 64-6.