PROBLEM TO BE SOLVED: To provide an optical sterilizer capable of blocking harmful ultraviolet rays within a certain range and effectively sterilizing, and not having a risk of damaging the health of surrounding personnel. SOLUTION: The sterilization light source 104 and a structure for accommodating and fixing the sterilization light source, and having a foldable structure so as to shield a light beam emitted by the sterilization light source so as to be selectively in an expanded state or a stored state, are developed. The sterilization apparatus 100 includes a housing 102 that occupies a volume that is larger than the volume that the storage state occupies. [Selection diagram] Figure 1【課題】一定の範囲内で有害な紫外線を遮断し、有効に殺菌することができ、周囲の人員の健康を害するおそれのない光殺菌装置の提供。【解決手段】殺菌光源１０４、及び、殺菌光源を収容し固定し、殺菌光源が発する光線を遮蔽するための、選択的に展開状態又は収納状態にあるように折り畳み可能な構造を有し、展開状態で占める体積が収納状態で占める体積よりも大きい筐体１０２を含む、殺菌装置１００。【選択図】図１
