KNEE PROTECTING AIRBAG DEVICE

A knee protecting airbag device comprises an airbag (26) housed in a housing and being expandable and inflatable for protecting knees when fed with inflation gas. The airbag (26) includes a knee-side wall (28) deployable toward the knees and a vehicle body side wall (27) opposing the knee-side wall. The airbag (26) further includes tethers (29) as length adjusting means that shorten a length (LU) in a longitudinal direction of the vehicle body side wall (27) relative to that (LD) of the knee-side wall (28).