Water sterilization device

Abstract

The objective of this invention is to improve the reliability of a flowing water sterilization device. The means by which this invention solves this objective is a flowing water sterilization device 10, comprising: a flow path housing 12 having an internal space 20 for allowing water to be treated to flow; a reactor 14 disposed within the internal space 20 and having a treatment chamber 42 for containing the water to be treated; and a light source unit 16 disposed within the internal space 20 and irradiating the water to be treated in the treatment chamber 42 with ultraviolet light 18. The reactor 14 has: an opposing portion 50 facing the light source unit 16 along a predetermined axial direction. The opposing portion 50 includes: a main opening 52 extending axially between the treatment chamber 42 and the light source unit 16 and allowing ultraviolet light 18 to pass through; and an engaging portion 54 engaging with the light source unit 16 and restricting the displacement of the light source unit 16 radially orthogonal to the axial direction.

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