A vehicle center airbag may include a main cushion and a plurality of sub-cushions. The main cushion is mounted on a lateral surface of a seat back and is deployed in a forward direction, being positioned beside a passenger when a side collision occurs. The sub-cushions are configured to communicate with the main cushion and are deployed upwards from the top portion of the main cushion. When the sub-cushions are deployed, they extend in a forward-backward direction of the vehicle and are positioned above the torso of the passenger.