To simply change a detecting specification of Pachinko balls (discharged balls) discharged to outside from the Pachinko game machine in accordance with a request, etc. from a Pachinko hall side.

A counter fitting part 24 for fitting a discharged ball counter 23 is provided at a ball discharging path 22 of the Pachinko game machine 12. For example, when detection leakage of discharged balls occurs when adopting constitution of detecting the discharged balls only by a discharged ball counter 28 at a ball collecting path 26 on the side of a Pachinko island, the discharged ball counter 23 is fitted to the side of the Pachinko game machine 12 to allow this discharged ball counter 23 to detect the dropping discharged balls to the side of the ball collecting path 26 from the Pachinko game machine 12. When the detection leakage of the discharged balls occurs even when detecting the discharged balls only by the discharged ball counter 28 provided on the side of the ball collecting path 26 on the other hand, the discharged ball counter 23 is not fitted to the side of the Pachinko game machine 12, thereby eliminating the unnecessary discharged ball counter 23 to attain cost reduction.