An airbag module for a vehicle according to the present invention includes: an inflator; and an airbag cushion which is deployed by high pressure gas discharged from the inflator, in which a dead zone, which allows the high pressure gas discharged from the inflator to branch off and flow through at least two branch flow paths, is formed in the airbag cushion, and a variable tether, which guides the high pressure gas passing through the at least two branch flow paths to the upper side of the airbag cushion and has a plurality of vent holes that is opened so that upper and lower portions of the airbag cushion communicate with each other when internal pressure of the airbag cushion exceeds a preset value, is installed in the airbag cushion, such that the high pressure gas is quickly and uniformly distributed and supplied into the airbag cushion.