PROBLEM TO BE SOLVED: To provide a daylighting sheet capable of suppressing direct projection of sunlight (direct incident light), allowing efficient lighting, and making an outdoor side visible from an indoor side.SOLUTION: A daylighting sheet includes: a base material layer 22 and a light deflection layer 23 configured to deflect light. The light deflection layer includes: a plurality of light transmission parts 24 arranged along a side of the base material layer and light deflection parts 25 arranged between the plurality of light transmission parts and filled with an ultra-violet ray curable resin composition having a refractive index lower than the light transmission part. At a portion with the light transmission part arranged, the front and back sides of the light deflection layer are formed in parallel, and in a vertical section in a thickness direction of the daylighting sheet, the upper side of the light deflection part is formed as a polygonal line in which a plurality of straight lines continue, or a curved line, and the upper side is formed projecting downward. The lower side is a single straight line tilted by 0-30°, inclusive, relative to the normal line of the sheet surface. An angle at a light emission side end part relative to the normal line of the sheet surface of the upper side is smaller than an angle relative to the normal line of the sheet surface of the lower side.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【課題】太陽光の直射(直達光)を抑制するとともに効率良く採光でき、室内側から室外側を見ることが可能な採光シートを提供する。【解決手段】基材層22と、光を偏向する光偏向層23とを備え、光偏向層は、基材層の面に沿って複数配置された光透過部24と、複数の光透過部間に、該光透過部よりも低い屈折率の紫外線硬化型樹脂の組成物が充填された光偏向部25とを有し、光透過部が配置された部位の光偏向層の表裏面は平行に形成されており、光偏向部は採光シートの厚さ方向断面において、上部となる側の辺が、複数の直線が連続した折れ線、又は曲線状で形成されており、上部となる側の辺は、下に凸となるよう形成され、下部となる側の辺は、1つの直線状であるとともに、シート面法線に対して0°以上30°以下であり、上部となる側の辺のうち光の出射側端部におけるシート面法線に対して成す角は、下部となるシート面法線に対して成す角よりも小さい。【選択図】図3
