To provide a prize ball discharge device of a Pachinko machine that can decrease drive frequency of discharging prize balls.

The prize ball discharge device of the Pachinko machine includes: prize-winning ball detection switches that detect individual prize-winning balls entering a plurality of prize-winning ports; and a prize ball discharge control part that controls a prize ball discharge mechanism part to discharge prize balls according to the number of prize ball instruction discharges output based on a prize-winning ball detection signal input by each prize-winning ball detection switch. The prize ball discharge control part comprising a remaining prize ball counter, which counts the number of remaining prize balls obtained by sequentially accumulating the number of prize ball instruction discharges, decides whether the number of the remaining prize balls is a specified predetermined value or above than the number of prize balls discharged as a large value by entering the preset respective prize-winning ports, controls the prize ball discharge mechanism part to discharge the number of remaining prize balls when the number of the remaining prize balls is the predetermined value or fewer, and controls the prize ball discharge mechanism part to discharge the predetermined amount of prize balls when the number of remaining prize balls is the predetermined value or above.