The Treaty of Friendship, Commerce and Navigation between the Joseon Dynasty and Japan began signing procedures from February 1876. Thus, Busan port became an open port to foreign vessels. This has resulted in Busan port becoming the greatest port in Korea. Because of this, the Superintendent Office (Gamriseo, 監理署) was established at 1883 but was later abolished in 1906. In this thesis, the author explored the opening procedure of Busan Port as an open port, the structure of the positions in the Superintendent Office, and the establishment and abolition, types, and contents of records of Gamriseo that were created or received. Records of the Superintendent Office were classified into diplomatic records, judge records, police records, customs records, administrative records, and the daily records of the institution. Most of the original documents of the Superintendent Office were preserved at the Kyujanggak Institute for Korean Studies while some were published by the National Institute of Korean History and Asiatic Research Institute of Korea University.