PROBLEM TO BE SOLVED: To provide a sterilizer capable of suppressing discoloration of a resin caused by deterioration of the resin by irradiation with ultraviolet rays while keeping a sterilization function.SOLUTION: A sterilizer 1 which sterilizes by irradiating the surface of a resin with ultraviolet rays includes: a light-emitting section 6 having a flash discharge tube 5 for emitting ultraviolet light and a transmission restriction section 7 which is provided between the light-emitting section 6 and the resin, and restricts transmission of light having a wavelength other than 265 nm or transmission of light a wavelength of 250 nm or less, out of the ultraviolet light emitted from the light-emitting section 6.COPYRIGHT: (C)2015,JPO&INPIT【課題】殺菌作用を維持しつつ、紫外線照射による樹脂の劣化が原因の樹脂の変色を抑制することができる殺菌装置を提供する。【解決手段】樹脂の表面に紫外光を照射して殺菌を行う殺菌装置1であって、紫外光を発光する閃光放電管5を有する発光部6と、該発光部6及び樹脂の間に設けられて、前記発光部6から発光される紫外光のうち、265nm以外の波長の光の透過または、250nm以下の波長の光の透過を制限する透過制限部7とを備える。【選択図】図1