The airbag of an airbag apparatus is provided with a slip member that is disposed on the outer surface of an occupant protection area of an airbag main body and can suppress load to an occupant by allowing the airbag main body to slide when the airbag comes in contact with the occupant while being developed and inflated. The slip member is connected to the airbag main body at both left and right edges and a rear-lower edge. In the slip member, a left connecting portion and a right connecting portion for connecting both left and right edges to the airbag main body are connected at a position before and above the center of the occupant protection area, and the rear connecting portion for connecting the rear-lower edge to the airbag main body is connected at a position rear-lower the center of the occupant protection area.