Airbag device with a knee bag

The object is to provide an occupant protection device which can adequately protect an occupant by combining an airbag which expands in front of the upper half of the body of an occupant and a knee bag which expands in front of the legs of the occupant. In order to achieve this object, an occupant protection device is proposed in which, when an automobile collides, an inflator (18) ejects gas to expand a knee bag (14). By being pushed by the expanding knee bag (14), removal of a lid (20) starts. Then, the knee bag (14) is expanded along the front surface portion of a case (12) and an interior panel (10) in the vicinity thereof. A passenger-seat airbag (30) expands in front of the upper half of the body of an occupant by gas ejected from an inflator (34) that has been operated, and the expanded passenger-seat airbag (30) receives the upper half of the body of the occupant. When the knee bag (14) and the airbag (30) are both in completely expanded states, a top end portion (14t) of the knee bag (14) is positioned at least 50 mm above a bottom end portion (30b) of the airbag (30).