[Object] To provide a disinfection apparatus using deep ultraviolet light-emitting diodes as a light source having a longer life and lower consumed power than the mercury lamp where object to be disinfected can be irradiated with deep ultraviolet rays having high intensity, thereby performing disinfection efficiently, maintenance is facilitated and downsizing is possible. [Solving Means] In an ultraviolet disinfection apparatus where an object to be disinfected flowing through a flow path (140) surrounded by an ultraviolet transmitting material such as quartz is irradiated with deep ultraviolet rays and is disinfected, a light source modularized (110) by arranging a plurality of ultraviolet light-emitting devices such as deep ultraviolet light-emitting LEDs and a light condenser (120) for condensing deep ultraviolet rays emitted from each ultraviolet light-emitting device in the module using, for example, a long elliptical reflective mirror are unitized (130) to be arranged around the flow path. The object to be disinfected is irradiated with the deep ultraviolet rays condensed by the light condenser.
