PROBLEM TO BE SOLVED: To solve the problem in which: the conventional techniques of ventilators for vinyl greenhouses using steel pipes as a framework are large-scale and cost much； and there are also techniques to attach a ventilation window directly to vinyl, but they have a defect of decreasing attachment strength by aged deterioration etc. because of the structure of attaching it directly to vinyl.SOLUTION: In a vinyl greenhouse using steel pipes as a framework, the invention comprises: a steel pipe fixing part capable of being attached to any position of two parallelly adjacent steel pipes of the vinyl greenhouse； a door frame part to hold vinyl between the steel pipe fixing part and itself； and a door part which is attached to the door frame part and has a role of a lid； wherein the shape of a ventilating opening in the center of the steel pipe fixing part is a vertically long shape, and its dimensions are determined so that the door frame part to which the door part is attached can pass through the ventilating opening.【課題】鋼管を躯体とするビニールハウスの換気装置の従来の技術は、大掛かりで高コストの換気装置であった。また、ビニール自体に取り付ける換気窓の技術もあるが、ビニールに直接取り付ける構造のため経年変化等により取り付け強度が低下するという欠陥があった。【解決手段】鋼管を躯体としたビニールハウスにおいて、ビニールハウスの隣り合う平行な２本の鋼管の任意の場所に取り付け可能な鋼管固定部と、ビニールを鋼管固定部と共に挟みこむための扉枠部と、扉枠部に取り付けられ、蓋の役目をする扉部を備えた構成とし、鋼管固定部の中央部の換気口形状を縦長形状にし、扉部を取り付た状態の扉枠部がこの換気口を通過できる寸法にした。【選択図】図２
