An airbag cover to be mounted to correspond to a passenger seat of a vehicle is disclosed that provides an effective technique to ensure the strength, during opening, of an opened end in the part opening toward an occupant pushed by an inflating and developing airbag. In an airbag cover according to one form of the present invention, a part opening toward an occupant pushed by an inflating and developing airbag is configured such that in regard to a spaced distance between an opened end of a flap part and a plurality of bonding ribs, each of the spaced distances in the regions of corners of the opened end is smaller than the spaced distance in the region of the hinge part.