PROBLEM TO BE SOLVED: To provide a heat ray reflection film structure capable of economically and efficiently cultivating plants in an agricultural house utilizing sunlight.SOLUTION: The above problem of the present invention is solved by using the heat ray reflection film structure which is obtained by alternately laminating at least two kinds of resin layers having different refraction indexes, and consists of a woven fabric formed by weaving a thin strip tape 11, as a warp or weft, which is cut from a raw film provided with a lubricity imparting layer in at least one side surface of a multilayer laminated film, in which an average transmittance of visible light (light having a wavelength of 400 to 750 nm) is 80% or more, and an average reflectance of a heat ray (light having a wavelength of 800 to 1100 nm) is 70% or more, and filament yarns 12, 13 or spun yarns as a weft or warp, wherein the thickness of the filament yarn or the spun yarn is 0.01 to 0.30 times the width of the fine band tape, and the interval between the adjacent thin strip tapes is 0.1 to 0.5 times the width of the fine strip tape.SELECTED DRAWING: Figure 2【課題】本発明の課題は、太陽光を利用する農業ハウスでの植物の栽培を経済的かつ効率的に行うことのできる、熱線反射フィルム構造体を提供することにある。【解決手段】本発明の上記課題は、屈折率の異なる少なくとも２種類の樹脂層を交互に積層して得られ、可視光（波長４００～７５０ｎｍの光）の平均透過率が８０％以上、熱線（波長８００～１１００ｎｍの光）の平均反射率が７０％以上である多層積層フィルムの少なくとも片側表面に滑性付与層を設けた原フィルムを裁断した細帯状テープ１１を経糸または緯糸とし、フィラメント糸１２、１３または紡績糸を緯糸または経糸として織編成した織編物からなり、フィラメント糸または紡績糸の太さが該細帯状テープの幅の０．０１～０．３０倍であり、隣接する該細帯状テープの間隔が該細帯状テープの幅の０．１～０．５倍である、熱線反射フィルム構造体を用いることにより解決される。【選択図】図２
