SEAT AIRBAG FOR VEHICLE

The present invention relates to a seat airbag for a vehicle in which a side cushion 100 is deployed to protrude forward from a seatback 10 and protects the side of a passenger 20, a front cushion 200 is deployed to protrude from the side cushion 100 to the front of the passenger 20 and protects the front of the passenger 20, an upper tether 300 and a lower tether 400 exhibiting strong restraint force are connected to the side cushion 100 and the front cushion 200. Thus, it is possible to effectively restrain the passenger's lateral behavior, forward behavior, and diagonal behavior, thereby further enhancing the passenger's protective effect.