Byul-Gam is a low-ranking official who takes charge of sundry services in Yi-Dynasty court, .and escorts his king when he make a honored going. Uniforms of Byul-Gam are noted for their gaiety. This study aims at inquiring into uniforms of Byul-Gam through historical records. The resultant findings are as follows: 1) Uniforms of Byul-Gam are divided into full dress and ordinary clothes. 2) The full dress has two kinds of style. One is Dan-Ryung, a kind of robe, clad together with -Gun as a headdress. This robe is blue, Gun for king`s Byul-Gam violet, and Gun for the Crown Prince`s Byul-Gam blue. The other is a combination of yellow Cho-Rip and red Chup-Ri. This is a military uniform. 3) Ordinary dresses for Byul-Gam are orange Cho-Rip and red Jik-Ryung. Underwear in this case is Hyup-Joo-Um and Chup-Ri. Hyup-Joo-Um is a kind of robe. Inside it Korean style of jacket and slacks are usually clad. 4) As time passed, the uniform of Byul-Gam had been changed from Cheong-Dan-Ryung to HongDan-Ryung, and Jik-Ryung had been shifted to a full dress. 5) Only five remains of Jik-Ryung for Byul-Gam have been handed down to us. The analysis of those indicate that they gradually became similar to Duru-Magi, a kind of Korean robe. This fact is common in the other transfiguring process of dresses of robe kind.