Embodiments of the present invention may include a vehicle seat having a seat cushion. The seat cushion may have a cushion frame, a cushion pad arranged on the cushion frame, and an airbag provided on a front portion of the seat cushion. The airbag preferably has a lower air chamber and an upper air chamber situated above the lower air chamber. The airbag is configured such that, when the upper and lower air chambers are at least partially filled with compressed air, the seat cushion is elongated while an upper portion of a peripheral wall of the lower air chamber supports a lower portion of a peripheral wall of the upper air chamber.