SEAT AIRBAG FOR VEHICLE

The present invention relates to a seat airbag for a vehicle in which a side cushion is deployed to protrude forward from a seatback and protects the side of a passenger , a front cushion is deployed to protrude from the side cushion to the front of the passenger and protects the front of the passenger , an upper tether and a lower tether exhibiting strong restraint force are connected to the side cushion and the front cushion . 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.