The present design relates to gangseongbo the steel frame of the rear side of the car. The present design is in the rear side frame gangseongbo steel structure consisting of a reinforcing member of U-shape that is adjuster pad to the rear side frame and the inner surface of the rear side frames of the U-shape bending at a right angle to be welded, fixed to the lower floor panel welding the reinforcement member is characterized by having a shape with a closed end face between the bend portions of both side bent portion and the rear side frame can be formed, and also, welded adjuster pad to the inner surface of the reinforcing member, the reinforcing member It may comprise a second reinforcement member has a shape that can be a closed end surface is formed between the bent portion.
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