Hinge device of a vehicle seat according to the invention, is formed in the bottom center of the seat frame the vehicle seat, which seat is pivoting the sheet to maintain a locking state in which the to the seating folded state or passengers to load the luggage in the vehicle body of the in the hinge device, which consists of a frame shape which space apart so as to be opposed to be formed can be fixed to receive said seat frame, and fastening the hinge earth stop, it protrudes from the spaced frame to which a frame lower sides hinged frame in which the friction portion is formed, and the lower portion is formed a ball signed to promote the body and fixed, is formed with a guide nine stops, the upper part of the hinge fastening district and hinge fastened to the hinge frame, promote the hinge pivot hinge frame doedoe spaced configuration so that brackets are opposite the of the spaced bracket spring stop in any one of the bracket engaging hinge bracket which ring is formed and, soon as interposed guide sphere of said spaced hinge bracket at the same time the friction portion formed on the hinge frame by the outer periphery it is accommodated is friction in the friction part according to the hinge pivot of the hinge frame guide shaft is guided in the sphere opposite sides and, the the spring engaging ring of the shaft and the hinge bracket, the lower end respectively engaging which acts an elastic force in the axial It comprises a spring.
Therefore, it the present invention is formed in the bottom center of the seat frame sheet can maintain a hinged while being guide sphere end axis is the seat frame, a fixed hinge bracket engaging in in when the rotation fixing the hinge bracket due to the elastic force of the spring state Therefore, the sheet when an external shock is applied to the sheet or damage to the vehicle body in the body of the occupant is protected with the result of improving the safety.