The present invention provides a more effective photocatalyst device. Kind Code: A1 Two photocatalyst members 111F and 111B facing each other, lights 112L and 112R for providing light to the two photocatalyst members 111F and 111B, and between the two photocatalyst members 111F and 111B. A photocatalyst device 100 is provided that includes a fan 120 for flowing air. [Selection diagram] FIG.【課題】より効果的な光触媒装置を提供する。【解決手段】互いに向かい合う２枚の光触媒部材１１１Ｆ，１１１Ｂと、前記２枚の光触媒部材１１１Ｆ，１１１Ｂに光を提供するためのライト１１２Ｌ，１１２Ｒと、前記２枚の光触媒部材１１１Ｆ，１１１Ｂの間に空気を流すためのファン１２０とを備える、光触媒装置１００が提供される。【選択図】図７
