AIR BAG DEVICE

An airbag device and an airbag system for a vehicle are provided. The airbag device includes an airbag cushion deployed to cover a side surface and a front surface of a seat, a restraint tether connected to the airbag cushion at a position passing a body part of a passenger between an inner surface of the airbag cushion and a seatback, and a tether wire connected from a front portion of the airbag cushion through an outside space of the airbag cushion to the restraint tether so that the restraint tether is pulled in a direction opposite to the passenger by a deployment force of the airbag cushion.