Abstract
This paper was built by following next steps. First, based on the records of the Tongshinsa, the official diplomatic mission Joseon dispatched to Japan, the actual conditions of wearing a Danryung, a official robe, in the 18th century were researched. Then the difference of wearing state between the missions - in 1719, 1748 and 1764- was found and the reason why was analyzed. In result two distinctions were found: 1) A black Danryung was worn in 1719 at the banquets and while receiving an official letter of reply, but a red Danryung, Gongbok or Sibok on the later trips. 2) In 1764 travel records there was some confusion of the names Gongbok and Sibok, which denote the same item of robes, according to the writer. The reason why those changes and confusion were caused is analyzed as follows: 1) After the Japanese Invasion(1592) and the Manchu Invasion of Joseon(1636), a black Danryung replaced the Gongbok for a while. But after the mid-18th century, when the Gongbok was revived, that was reappeared in the official ceremonies. 2) In the mid-18th century, both Gongbok and Sibok system had been revised. But because both color system was similar, those revision became a cause of confusion between Gongbok and Sibok. For a while all ministers wore red Gongbok and Sibok, but after those revision the color of official's robe was changed by officials' rank: the higher ranking officials' Gongbok and Sibok are red, the lower ranking officials' are bluish green.