Air bag system in scooter type vehicle

Object: To effectively restrain a rider on a seat provided at a rear portion of a vehicle body by means of an inflated air bag in a scooter type vehicle having a footrest for supporting the feet of the rider. Solving Means: An air bag (17) that can be inflated so as to restrain a rider on a seat (14) from the front side of the rider is accommodated in its folded condition inside a front end portion of the seat (14).