PROBLEM TO BE SOLVED: To provide a fluid sterilizer that improves an irradiation efficiency of UV light.SOLUTION: A fluid sterilizer 10 includes a passage tube 20 that partitions a passage 12, a light source 14 that is arranged at an end part (first end part 21) of the passage tube 20 and irradiates UV-light in an axial direction of the passage tube 20 toward a fluid 40 that flows the passage 12, a holding mechanism 30 that holds a substance having a low refractive index to the UV-light than the fluid 40 between an internal surface 26 of the passage tube 20 and the fluid 40. The holding mechanism 30 may have a fine irregular structure formed on the inner surface 26 of the passage tube 20.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】紫外光の照射効率を高めた流体殺菌装置を提供する。【解決手段】流体殺菌装置10は、流路12を区画する流路管20と、流路管20の端部(第1端部21)に配置され、流路12を流れる流体40に向けて流路管20の軸方向に紫外光を照射する光源14と、流路管20の内面26と流体40との間に流体40よりも紫外光に対する屈折率の低い物質を保持する保持機構30と、を備える。保持機構30は、流路管20の内面26に形成される微細な凹凸構造を有してもよい。【選択図】図1
