This invention relates to a bowling game system that prevents a ball from falling into one of gutters with no players noticing. A bowling game system 1 is provided with an approach 2 where a player rolls a bowling ball b down, a lane 3 on which the ball b players bowl rolls, a plurality of bowling pins 5 arranged and placed on the end of the lane 3 opposite to the approach 2, trough-like gutters 4 provided longitudinally on the both sides of the lane 3 to receive the ball b slipping from the lane 3, a plurality of nozzles 21 provided face to face longitudinally on the outer sides of the lane 3 and a compressed air supplying source 25 providing the nozzles 21 with compressed air via supplying pipes 22. The nozzles 21 discharge compressed air toward the inside of the lane 3 to prevent the ball b from falling into one of the gutters 4, which is not revealed to players, because the compressed air is transparent and clear.