The present invention relates to a bowling game system in which a play is possible without changing into bowling shoes. A bowling game system 1 includes: an approach 10 for allowing a player to carry out a bowling action; a lane 11 extending from the approach 10 and on which a ball bowled by the player rolls; a plurality of pins 12 arranged and placed on an end of the lane 11 opposite a side of the approach 10; trough-like gutters 13 provided paralleling both sides of the lane 11 to receive a ball slipping off the lane 11; a protection member 20, formed in a sheet-like shape, for covering a bowling action zone, the protection member 20 being laid in the bowling action zone of the player, the bowling action zone being on a top surface of the approach 10; and a protection-member installing mechanism 30 configured with a wind-in device 31 for winding in and collecting the protection member 20 in a retracting position outside the bowling action zone and a withdrawing device 34 for withdrawing the protection member 20 from the wind-in device 31 to a position covering the bowling action zone.