The present invention relates to a pier structure using a PC girder and a construction method thereof, which is a pier by an assembly structure in which a PC branch girder and a PC central girder are mounted on the head of a pile, and a PC girder is bolted, and then a PC slab is mounted on the top. In order to shorten the construction period and secure structural stability from external forces such as earthquakes by the prefabricated fitting structure of the PC members, and to improve the workability of offshore work due to the weight reduction of the PC member, the PC branch girder (100), PC It consists of a main configuration including a central girder 200, a PC girder 300, and a PC slab 400.
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