The present invention relates to the head structure of the steel pipe pile foundation for pier, which can easily fix the steel bars fixed above the steel pipe to shorten the air and reduce the construction cost, and also to reduce the pressure It is not deformed so that it can be firmly constructed. The reinforcement of the inner circumference of the reinforcement ring is also reinforced inside the steel pipe, which improves the stability of the foundation structure. The waterproof plate is integrally formed with concrete to solve the problem caused by corrosion. In addition, they are the same concrete material so that they can be integrated to contribute to the rigidity reinforcement.;To this end, the present invention is a waterproof plate formed of concrete, and the connection between the fixed around the waterproof plate, and the reinforcing groove is accommodated in the inner circumferential surface is accommodated in the outer peripheral portion of the reinforcing bar, the downward connection between the through hole is provided One or more reinforcing rings of a small diameter are arranged under the reinforcing bar that is inserted into the bottom of the reinforcing groove of the waterproof plate through the above-described bracket and the bracket.;This invention has the advantage that can greatly reduce the time required for the preparation and construction of parts, there is a useful effect that can improve the construction quality.;Pier, steel pipe, pile foundation
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