LOWER LIMB RESTRAINT AIRBAG DEVICE

A lower limb restraint airbag device, including: an airbag that is configured to be inflated and deployed toward a knee and a shin of a passenger seated in a vehicle seat by gas ejected from an inflator, and to make contact with at least the knee; a reaction force plate that is configured to be pulled out to a seat front side of the airbag in conjunction with inflation and deployment of the airbag; and a lock mechanism that is configured to block movement toward a seat front side of the pulled out reaction force plate.