An ultraviolet light sterilizer including: a deep ultraviolet light source including one or more ultraviolet light emitting diode and irradiating a deep ultraviolet ray toward a body to be sterilized and a control means wherein the control means controls one or more selected from the group consisting of: (1) an irradiation time t (unit: second) defined as a time for which the deep ultraviolet ray is irradiated to the body to be sterilized, (2) a distance d (unit: cm) between the body to be sterilized and the deep ultraviolet light source, and (3) an emission power P (unit: mW) of the deep ultraviolet light source, such that an integral irradiance I (unit: mJ/cm2) of the deep ultraviolet ray irradiated to the body to be sterilized during the irradiation time reaches a predetermined value I0.一種紫外線殺菌裝置,具有:深紫外線光源,該深紫外線光源具有一個以上的深紫外線發光二極體,且朝向被殺菌體射出深紫外線;和控制機構,該控制機構係控制從(1)以對被殺菌體照射深紫外線之時間被定義的照射時間t(單位:秒),(2)被殺菌體和深紫外線光源之間的距離d(單位:cm)及(3)深紫外線光源之發光輸出P(單位:mW)選出之一個以上,使照射時間內對被殺菌體照射之深紫外線之累積照射量I(單位:mJ/cm2)成為預定值I0。10‧‧‧框體10a‧‧‧前面10b‧‧‧後面10c‧‧‧上面10d‧‧‧底面10e、10f‧‧‧側面11‧‧‧門20‧‧‧深紫外線光源30‧‧‧控制裝置40‧‧‧支撐台60‧‧‧輸入輸出機構100‧‧‧紫外線殺菌裝置
