Disclosed herein is an airbag apparatus for vehicles, which is capable of minimizing the loss of pressure of an airbag cushion. The airbag housing of the airbag apparatus accommodates an airbag cushion which is deployed through an opening. An airbag deployment door is placed to face the opening and separated from the cut notch of a crash pad cover when the airbag cushion is deployed. A chute is connected to a surface of the airbag deployment door through a curved hinge portion which is placed to be parallel to the sidewall of the airbag housing.