To provide a mushroom cultivation bag which makes pinholes less likely to occur in a bag body at a medium bag filling step and at a heat sealed part of a bag body.SOLUTION: The front and rear films 11a, 11b of predetermined size and shape and the side film connecting the side edges of the front and rear films at the left and right are provided, and the opening which is expanded to a substantially quadrangular shape at the upper top side portion 13, a folded portion 12a, 12a in which the side film is folded inward by a predetermined depth, and a heat sealed seal portion 16 thermally welded to an opening facing the opening in the lower base portion, and the front and back films 11a, 11b Is a mushroom cultivating bag which is made of a plastic film and in which at least one of the films is formed with a ventilation hole and the vent hole is blocked with a filter 18 which allows air to pass therethrough while preventing intrusion of germs to the inside, The plastic film has a thickness of 60 m or more and is manufactured with a blow ratio in the inflation method of 2.5 to 3.45.BACKGROUND OF THE INVENTION【課題】培地袋詰め工程時及び袋体の熱シール箇所において袋体にピンホールが発生し難くしたキノコ栽培袋を提供する。【解決手段】所定大きさ及び形状の表及び裏フィルム11a、11bと、表裏フィルムの側縁間を左右で繋いだ側フィルムを有し、上方頂辺部に略四角形に拡口される開口部13と、側フィルムを内側へそれぞれ所定深さ折り込んだ折り込み部12a、12aと、下方底辺部にあって開口部に対向する開口を熱溶着した熱溶着シール部16を備え、表裏フィルム11a、11bはプラスチックフィルムからなり、少なくとも一方のフィルムに通気孔が形成されて、通気孔が内部への雑菌の侵入を防ぐ一方で空気を通過させるフィルター18で塞がれたキノコ栽培袋であって、このプラスチックフィルムは、その厚が60μm以上であり、インフレーション法のブロー比が2.5~3.45の範囲で作製されている。【選択図】図1
