PURPOSE: To permit grasping the number of balls possessed by each unitary block covering a plurality of pachinko machines in which pachinko balls circulate by allowing a hall computer to operate the specific formulae for each table within the business hours and emit the result from calculating appropriately.

CONSTITUTION: A unitary block 1 is configured with a plurality of pachinko game machines 2, inter-machine ball lease machine(s) inter-machine ball counter (s) 4 to count the cast-in pachinko balls and return to ball supplying devices, and award ball counting device 5. A hall computer 8 calculates cumulatively the number of lease balls discharged by each inter-machine ball lease machine 3, the number of safe balls and out balls of each pachinko machine 2, and the number of award balls counted by the award ball counting device 5. Therein the computer 8 operates the following formula within the business hours and emits the result from calculating as a discharge stop signal or a count interrupt signal; the formula express the change in number of possessed balls=cumulated number of award balls-{cumulated number of lease balls-(cumulated number of out balls-cumulated number of safe balls)}. Thereby the number of balls possessed by the whole unit table 1 is grasped simply.