PROBLEM TO BE SOLVED: To improve irradiation efficiency of ultraviolet light for a fluid inside a flow channel.SOLUTION: The fluid sterilization device includes: a flow channel member having a first flow channel for allowing a fluid to flow a light source part which is disposed by opposing to a flow channel sectional face of the first flow channel crossing with a flow direction of the fluid and includes a light emitting element for irradiating ultraviolet light to the inside the first flow channel a connection member connected to one end of the flow channel member and having the light source part provided therein, which includes a second flow channel disposed in the periphery of the light source part while communicating with the first flow channel and includes a housing part for housing the light emitting element and an optical system which is provided by covering an opening of the housing part and refracts the ultraviolet light emitted from the light emitting element to be made incident onto the inside the first flow channel.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2019,JPO&INPIT【課題】流路内の流体に対する紫外線の照射効率を高める。【解決手段】実施形態の流体殺菌装置は、流体を流すための第1の流路を有する流路部材と、第1の流路の、流体の流れ方向に交差する流路断面に対向して配置され、第1の流路内へ紫外線を照射する発光素子を有する光源部と、流路部材の一端に接続されると共に光源部が設けられ、光源部の周囲に配置されて第1の流路に連通する第2の流路と、発光素子が収容される収容部と、を有する接続部材と、収容部の開口を塞いで設けられ、発光素子が発する紫外線を、第1の流路内へ入射するように屈折させる光学系と、を備える。【選択図】図3
