The invention discloses a vehicle seat having improved performance of reducing whiplash injury. A vehicle seat may include a protrusion member installed to a lower portion of a back frame inside a seatback to protrude forward and to absorb an impact on the hips of an occupant upon a vehicle collision, wherein a lower portion of the seatback, which has a protrusion shape due to the protrusion member, induces a sitting posture of the occupant to be modified when the occupant sits down on the vehicle seat, thereby reducing a gap between a head of the occupant and a headrest in a state that the hips of the occupant moves forward.