Knee airbag device for vehicle

A knee airbag device for a vehicle comprising:

• gas generating means for generating gas by operating;
• a knee airbag that is housed in a folded-up state, and that is disposed at a height of knees of a vehicle occupant who is in a seated state, and that inflates and expands toward the knees of the vehicle occupant due to gas supplied from the gas generating means;
• and
• an airbag cover that covers the knee airbag in the folded-up state, and that is provided with a first tear portion that, when bag inflation pressure of a predetermined value or greater is applied, fractures, and expands first airbag doors in a vehicle vertical direction, and second tear portions that are formed continuously with the first tear portion and that, even when an obstruction exists on a locus of movement at an initial stage of expansion of the first airbag doors, expand second airbag doors in a vehicle transverse direction,
• wherein the first tear portion is formed in an H-shape that includes a pair of left and right vertical direction tear portions, and a first lateral direction tear portion that connects these vertical direction tear portions in the vehicle transverse direction,
• the second tear portion is structured so as to include second lateral direction tear portions that extend from both end portions of the respective vertical direction tear portions toward sides opposite the first lateral direction tear portion, and
• the first tear portion further includes third lateral direction tear portions that extend from the both end portions of the respective vertical direction tear portions in parallel to the first lateral direction tear portion and toward sides opposite the second lateral direction tear portions and on same straight lines thereof, wherein when a distance between the first lateral direction tear portion and the second lateral direction tear portion is A, and a length of the second lateral direction tear portion is B, and a length of the third lateral direction tear portion is C, they are set to A=B=C.