To provide a Pachinko game system for preventing a fraudulent action to fraudulently put out dispensed balls by forcibly changing the signal level of a put-out request signal to be transmitted from a prepaid recording medium reader to a Pachinko game machine.

A prepaid recording medium reader 100 transmits a put-out request signal BRQ, for performing changes multiple times between a high level and a low level in the one cycle of the signal, to the put-out control board 60 of the Pachinko game machine 1. The CPU 61 of the put-out control board 60 analyzes the received put-out request signal BRQ (S32), and when it is determined that the signal is not a normal signal (S33: No), performs an error notification without putting out the dispensed balls (S41).