US Patent 9796350 Knee-protection airbag device

A knee-protection airbag device includes: an airbag being inflatable when an inflating gas flows thereinto; and a casing receiving the airbag in a folded state, wherein: the casing includes an attachment seat portion attached to an attachment bracket disposed to extend from a body; the casing includes an engagement portion engaging with a target engagement portion formed at the attachment bracket; when the engagement portion engages with the target engagement portion while the suspension portion is suspended on the target suspension portion, the airbag assembly is suppressed from rotating backward and deviating in a horizontal direction; and when the attachment seat portion contacts a rear face of a fixation seat portion, the attachment hole formed at the attachment seat portion matches an attachment hole formed at the fixation seat portion.