An airbag apparatus for a vehicle is provided with an airbag whose upper end portion is fixed to a vehicle body over a longitudinal direction of the vehicle body between an upper portion of the vehicle body and an interior member in a vehicle compartment and which is adapted to develop in a curtain-like shape downwardly, an inflator adapted to generate gas fed to the airbag, a folded portion formed by folding the airbag, and a turned-back portion formed by turning back a portion of the airbag positioned between the upper end portion and the folded portion so as to be provided with a first turned-back portion positioned on the side of the vehicle compartment and a second turned-back portion positioned between the first turned-back portion and the folded portion. At least one of the first turned-back portion and the second turned-back portion is turned in between the folded portion and the vehicle body.