In order to restore and scientifically conserve the gilt bronze sarira casket found in the west stone pagoda of Kam nsa Temple in 1959, the National Museum of Korea made its preliminary investigation in the spring 1985. After the deliberation by the Cultural Properties Committee, it was decided to make scientific conservation and restore the casket. The conservation and restoration on work of the sarira casket took place between February 10 and July 20, 1986. The restored casket is now on public display. The Conservation Laboratory decided on the following for the conservation and restoration of the sarira casket : 1) The general methods and B. T.A. treatment will be employed to stabilize bronze disease. 3) Bronze patina will be scraped off and polished, so that gilt surface may be revealed. 3) Parts will be joined and assembled where it is possible to do so without difficulty using easily removable synthetic resin to ensure easy dissembling of the restored sarira casket whenever it is necessary to do so. 4) While, in principle, lost parts will not be restored, those lost parts which must be restored in order to maintain the overall shape of the case will be restored after consulting specialists in the related areas. 5) The restored portions will be colored to go with the surrounding original surface. The actual conservation and restoration work underwent the following steps. 1) Examination of parts and decision of treatment methods 2) Preliminary investigation 3) Desalination and cleaning 4) Revealing of gilt surface 5) Stabilization of bronze disease 6) Coating of protective lacquer 7) Joining and assembling 8) Restoration and coloring 9) Finishing touches Upon the restoration of the sarira casket, it was found that in the drawings in "The Excavation Report of the Kam nsa Temple Site" the lid, two of the Four Guardian Kings and the ornaments of the flower-grass design were misplaced, and the floor was reversed. Now that the sarira casket has been restored, it should be designated under a single name of the gilt bronze sarira casket from the Kam nsa temple site. Formerly, the sarira casket was split into two different artefacts : the bronze sarira case from the Kam nsa temple site and the bronze Four Guardian Kings from the same site. In view of the importance of the casket in Korean art history and science-technological history because of its known date of manufacturing, metallographic study and analysis and research into its manufacturing technology and method should be made. Whereas the excavation report implied embossing or similar methods, the X-ray investigation at my laboratory strongly suggested that the casket was custom-made by lost -wax method. The fact that no two decorative patterns on the casket are identical also supports our suggestion. It is proposed that further research be made in cooperation with metalwork and metallurgic experts. A further study in terms of Korean art history of the parts not used for restoration and of the sarira container inside the casket should be made and their conservation treatment should be made after consulting those who have excavated the sarira casket.