An airbag system is configured to fulfill its role on a saddle-ride type vehicle even when the vehicle collides with a side of a vehicle moving in a generally perpendicular direction. An embodiment of the airbag system includes an airbag which is configured to the inflated and fully upward from the vehicle front of a rider. The airbag includes a head part opposite to a rider's head during inflation and deployment, and a neck part which rises upward from the vehicle and toward the head part. The neck part has a width in a direction of vehicle width which is narrower than that of the head part. The neck part includes neckings curved inward in the direction of the vehicle width.