The invention relates to a driver's knee airbag (1), in particular for a motor vehicle, with a gas generator (2), a plurality of chambers (5, 6, 7) and catch straps (3, 4). So that it deploys better and provides better protection for a vehicle occupant, in particular the driver, in the event of a crash, it comprises a first catch strap (3) dividing the airbag essentially horizontally, and two catch straps (4) extending essentially vertically from the first catch strap (3). The space between the steering column and the knees of the driver is therefore rapidly filled by the airbag in the event of a crash.