PROBLEM TO BE SOLVED: To provide a photocatalyst sheet having a resin film, in which the photocatalytic effect is sufficiently enhanced, as a substrate.SOLUTION: Provided is a photocatalyst sheet having a photocatalyst layer on at least one surface of a resin film substrate, and in which the surface on the photocatalyst layer side has a concavo-convex structure defined below. <；concavo-convex structure of photocatalyst layer side surface>； in the cross section obtained by cutting the photocatalyst sheet perpendicularly to the surface, the path length (X) of the concavo-convex formed by the surface of the photocatalyst layer side is 1.20 times or more with respect to the linear distance (L).SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】光触媒効果が十分に高められた、樹脂フィルムを基材とする光触媒シートを提供する。【解決手段】樹脂フィルム基材の少なくとも一方の面に光触媒層を有する光触媒シートであって、前記光触媒層側の表面が下記で定義される凹凸構造を有する、光触媒シート。 ＜光触媒層側表面の凹凸構造＞ 光触媒シートを表面に対して垂直に切断した断面において光触媒層側の表面により形成される凹凸の道程長さ（Ｘ）が、直線距離（Ｌ）に対して１．２０倍以上である。【選択図】図１
