An airbag device for a vehicle may include: a mounting housing having an airbag module mounted therein; one or more holders formed on the mounting housing; a steering wheel engaged to the holders; one or more mounting members slidably inserted into the engagement portion between the mounting housing and the steering wheel; and one or more hook members installed at positions spaced a predetermined distance apart from the center of the steering wheel, in order to fix the mounting member at a plurality of points.