The purpose of this study is to examine the roles and costume of Sodong as shown in the illustration of Choseon Delegation to Japan. Results of the study can be described as below. First, as shown in the illustration, Sodong played roles as Tongin and dancer. As Tongin, Sodong provided services or made errands for his seniors. In the other role, while, Sodong danced to comfort his seniors and show dances of Choseon to Japanese people. Second, Sodong wore Kwaecha over Sochangeui throughout his march with the delegation as Tongin. This is probably because the two clothes made him feel convenient and easily active. In both 1700s and 1800s, meanwhile, Sodong also wore Jikryeong and Cheolik. Third, Sodong wore Kwaecha over Sochangeui, or Danryeong and Nansam all the time when he navigated together with the delegation. When passing through Tsusima into the Japanese mainland, which meant starting international exchanges between Choseon and Japan, Sodong sticked to formality to the utmost by wearing Danryeong and Nansam. Fourth, Sodong wore Kwaecha over Sochangeui when he performed as dancer. The two clothes were also worn by Mudong during outdoor banquets in Choseon at that time. In addition, it is thought that Sodong wore Jikryeong, Danryeong and Nansam like when he marched or navigated together with Choseon Delegation.