An ultraviolet irradiation device that enables efficient sterilization treatment in a short time while giving priority to safety, enhances designability, and can also be used as illumination (can be used together). An ultraviolet irradiation apparatus includes an ultraviolet light emitting means capable of outputting ultraviolet light including a predetermined dominant wavelength, and a blocking means for blocking at least a part of the ultraviolet light. It is possible to switch between a blocking state and a non-blocking state. [Selection] Figure 1【課題】安全性を優先しつつも、短時間で効率的な殺菌処理を可能にするとともに、意匠性を高め、且つ照明としても使用できる（兼用可能な）紫外線照射装置を提供する。【解決手段】紫外線照射装置１００は、所定の主波長を含む紫外線を出力可能な紫外線発光手段１０１と、紫外線の少なくとも一部を遮断する遮断手段１０５と、を有し、遮断手段１０５による紫外線の遮断状態と、非遮断状態とを切替可能である。【選択図】図１
