PROBLEM TO BE SOLVED: To provide a photocatalyst device capable of improving a processing capacity.SOLUTION: A photocatalyst device related to one embodiment includes: a cylindrical housing having a polygonal inner shape of a cross section, and having a plurality of internal wall surfaces； a first light source part being provided on a first internal wall surface of the housing, and having a first light emitter； a first photocatalyst part being provided on a second internal wall surface facing the first internal wall surface of the housing, and having a first photocatalyst； and a second photocatalyst part being provided on a third internal wall surface adjacent to one side of the second internal wall surface, and having a second photocatalyst.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】処理能力の向上を図ることができる光触媒装置を提供することである。【解決手段】実施形態に係る光触媒装置は、断面の内形形状が多角形であり、複数の内壁面を有する筒状の筐体と；前記筐体の第１の内壁面に設けられ、第１の発光素子を有する第１の光源部と；前記筐体の前記第１の内壁面と対峙する第２の内壁面に設けられ、第１の光触媒を有する第１の光触媒部と；前記第２の内壁面の一方の側に隣接する第３の内壁面に設けられ、第２の光触媒を有する第２の光触媒部と；を具備している。【選択図】図１
