PROBLEM TO BE SOLVED: To provide a sterilizer effective to sterilization of a narrow region such as a root canal of a tooth.SOLUTION: A sterilizer 100 includes an irradiation part 10 having a semiconductor light-emitting element such as an LED for emitting an ultraviolet ray, for irradiating an irradiation target part with the ultraviolet ray emitted from the semiconductor light-emitting element, a feed section 12 for feeding liquid containing particles for reflecting the ultraviolet ray emitted from the semiconductor light-emitting element to a periphery of the irradiation target part, and a housing 14 having the irradiation part 10 and the feed section 12.SELECTED DRAWING: Figure 1【課題】歯の根管等の狭い領域の殺菌に有効な殺菌装置を提供する。【解決手段】殺菌装置１００は、紫外線を発するＬＥＤ等の半導体発光素子を有し、該半導体発光素子が発する紫外線を照射対象部に照射する照射部１０と、半導体発光素子が発する紫外線を反射する粒子を含む液体を照射対象部の近傍に供給する供給部１２と、照射部１０および供給部１２を有する筐体１４とを備える。【選択図】図１
