The subject innovation relates to the back door gangseongbo steel structure, the roof rail of 40 for holding the rear Panda 30 and the predetermined space 41 as a medium to CTR rail 20 on the lower side of the panel, the loop 10 is according to which is attached by welding; The rear panda 30 and between the space portion 41 of the 40 roof rail quot;? The type having a cross-section roof rail to Fran portion 51 extending reinforcement member (50) on both sides of (40 ) by being securely fixed by welding to, the rigidity is reinforced by which the reinforcement member 50 may be reinforced to increase the safety against a rear collision.; In addition, it is very useful for the design of such a deflection of the door is prevented from improving confidence in the product.
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