Patent ID: 7198290

Claim:
An air bag for a steering wheel that is folded and housed in a boss positioned in the vicinity of the center of a ring of the steering wheel which ring is gripped by a driver during steering, the air bag comprising: a driver side wall that is disposed on a driver side of the completely inflated air bag; a wheel side wall that has substantially the same outer shape as the driver side wall and is disposed on a steering wheel side of the completely inflated air bag; an opening that is disposed in the vicinity of the center of the wheel side wall and used for supplying an inflation gas therethrough, a periphery of the opening providing an area for attachment of the air bag to the steering wheel; a thickness regulating tether disposed in the vicinity of the opening for regulating a separation distance between the driver side wall and the wheel side wall of the completely inflated air bag and thus regulating a thickness of the completely inflated air bag; and an oscillation regulating tether disposed in the vicinity of the ring of the steering wheel as the airbag is completely inflated, for regulating a separation distance between the driver side wall and the wheel side wall, wherein: the separation distance between the driver side wall and the wheel side wall regulated by the oscillation regulating tether is set to a length capable of securing a cushioning action of the air bag, and is shorter than the separation distance between the driver side wall and the wheel side wall regulated by the thickness regulating tether; the oscillation regulating tether is connected to the driver side wall and the wheel side wall in such a manner as to extend perpendicularly to a plane defined by the ring of the steering wheel when the airbag is completely inflated; and the oscillation regulating tether is disposed only in an area on the rear side of the ring closer to an abdomen of the driver in the completely inflated air bag.