PROBLEM TO BE SOLVED: To provide a vinyl greenhouse having a double film structure, wherein: two films are superposed upon each other to be fixed by using a film-fixing member for stretching one conventional film； by sandwiching a baloon-like air layer-forming member between the two films, an air layer of approximately several cm to 10 cm is secured between the films； there is no additional frame member to the frame of a usual vinyl greenhouse to be required； the structure is low in cost and air blowing is not needed； and functions are not lost even when a small hole is made.SOLUTION: The double film spreading structure of the vinyl greenhouse for agriculture of the present invention is characterized in that an air layer-forming member 1 having a certain thickness is sandwiched between transparent films to be spread and fixed doubly and only in a part of the film surfaces, thereby securing a space between the double films 3, 4.【課題】通常の１枚フィルムを張るフィルム留め部材を用いて二枚のフィルムを重ねて留め、それら２枚のフィルムの間に風船状の空気層形成部材を挟みこむことで二枚のフィルムの間に数ｃｍ～十ｃｍ程度の空気層を確保し、通常のビニールハウスのフレームに対してなんら追加のフレーム部材を必要とせず、ローコストな構造でかつ送風する必要が無く、少々の穴が空いても機能を失うことがない、二重フィルム構造のビニールハウスを提供すること。【解決手段】本発明の農業用ビニールハウスの二重フィルム展張構造は、二重に展張固定される透明フィルムの間に、一定の厚みのある空気層形成部材１を、フィルム面の一部分のみに挟み込むことによって、二重のフィルム３，４の間に空間を確保することを特徴とする。【選択図】 図１
