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, having a specific duty ratio as the duty ratio (tb/ta) between a time ta to be changed into a high level and a time tb to be changed into 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 calculates the duty ratio of the received put-out request signal BRQ (S32), and when the duty ratio is not within the range of a regulation value (S33: No), performs an error notification without putting out the dispensed balls (S41).