Patent ID: 8419051

Claim:
An air bag device for rear-end collision, comprising: a rear-end collision detector that detects a rear-end collision of a vehicle; an inflator that in response to detection of a collision by the rear-end collision detector, supplies gas to an air bag; an air bag that is connected to the inflator, and inflates by gas that is supplied from the inflator; a sack-like body that houses the air bag and that extends widthwise and shrinks longitudinally; fastening sections that are provided on side frame of the vehicle, and that fasten the end sections in the longitudinal direction of the sack-like body; and a housing section that is provided at a top section or a bottom section of the vehicle along the side frame, and houses the sack-like body that is fastened to the fastening sections; wherein the sack-like body that is housed in the housing section extends widthwise and shrinks longitudinally as the air bag inflates, and maintains a tensed state and is positioned between the fastening sections.