The subject innovation relates to gangseongbo steel structure of the vehicle front door, bending the two ends to the bent part (3), the outer panel (2) forming and welding part (6) to be welded to the bent part (3) is formed in one end , but bending the inner side of the weld 6 to the multi-stage, in one predetermined part fixing part 7 is formed in the front panel 5 and the front panel 5, the inner panel at both ends is welded fixed to one end of the ( 4) and, bonded to the fixing part 7 and with the respective welded fixing the door chassis (8) opposite side to the bent side, front and rear longitudinal direction on the inner surface upper part of the outer panel (2) in the front panel 5 fixed and in the reinforcing belt (10) having a predetermined length, extended by extending the reinforcing belt 10 to be welded to the inner side surface upper portion of the outer panel (2) towards the fixed part 7 of the front panel 5 parts ( after the formation of the 11), be welded to the extended portion 11 to the door chassis (8) welded to the fixing part 7 of the front panel 5, the outer panel As to the welding fixing a reinforcing belt extending portion front panel and the door support firmly to the welding site of the chassis of the support to an external impact is enhanced in durability and rigidity of the front door is applied to the front door in the event of a side collision of the vehicle, the reinforcing belt is effectively and by reducing the bearing, the outer panel milrimyeo towards the inner panel variations and as soon be able to be broken to reduce to a minimum can protect at the same time the passengers of the cabin safety, and reducing the welded portion workability is enhanced to expect simplification of the working process, there is an effect that it is possible.
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