This paper makes a report of Shaman`s ritual performed among Korean resiednts in Japan as socio-historical facts, and this also examines the symbolic meanings of Shamans` costumes. The results are as follows ; 1) At the ritual of Jungsip-Wang Maji, Shamans wear Gwandae, Kunbok, Jangsam, Durumaki, and Chima-jugori. These costumes show that their wearers are priests and gods at the same time. 2) The reason why Simbang performs the ritual in different costumes at different Jaechas is that each object-god needs different costumes to represent its different character. 3) Shamans` instruments consist of musical instruments and other instruments. Among the musical instruments are such percussions as Buk, Jing, Janggo and Sulsae. Among other insttruments are Sindo, Sanban and Yoryung. 4)Shamans think that the musical instruments have magic powers to drive out minor demons and invite gods. Sindo, Sanban and Yoryung are thought to be the symbolic instruments representing god`s will.