To provide a pinball game machine capable of preventing such fraudulence as making a prize ball sensor malfunction without frequent occurrence of errors caused by insufficient put-out even if the pinball game machine is configured not to perform re-trying motion to be used in fraudulence.

The drive amount of a put-out motor, which puts out two more balls than a value set in a put-out counter, is set as a determination value in performing one put-out motion. When the drive amount has a value larger than the determination value, an error is determined. When one of two lines of ball leading pathways to a put-out device is clogged with balls, the determination value is changed to the double to perform the put-out motion.