PROBLEM TO BE SOLVED: To provide a vinyl house ventilation apparatus which has no fear that the opening and closing device is buried in the snow at normal snowfall amount or that cannot be opened quickly due to freezing, and in which cold air around the ground surface does not strike directly on the seedlings when it is opened, and in which water, snow ice, dust and the like are not adhered to a take-up portion so as not to be rolled in.SOLUTION: The lower end portion of the opening and closing sheet 2 is fixed to the lower end portion of the side window, the upper end portion is fixed to a take-up bar 3, and by taking up or back the opening and closing sheet 2 with the take-up bar 3, the side window of a vinyl house 1 is opened and closed. The lower end portion of a take-up bar supporting belt 4 for supporting the take-up bar 3 is fixed to both end portions of the take-up bar 3, and the upper end portion of the take-up bar supporting belt 4 is fixed to the structure of the vinyl house 1, so that the take-up bar 3 does not slide down. A cover portion 5 capable of covering the take-up bar 3 located at the upper portion of the side window when the take-up bar 3 rises and the side window of the vinyl house 1 is fully closed is installed on the upper end portion of the side face of the vinyl house 1.SELECTED DRAWING: Figure 1【課題】通常の積雪量において開閉装置が雪に埋もれたり、あるいは凍結して迅速に開放できない恐れがなく、開放時に地表部の冷気が直接苗に当たらず、巻き取り部分に水、雪氷、ゴミなどが付着して巻き込まれないビニールハウス換気装置を提供する。【解決手段】開閉シート２の下端部は側窓の下端部に固定され、上端部は巻き取り棒３に固定され、巻き取り棒３で開閉シート２を巻き取り、あるいは巻き戻すことにより、ビニールハウス１の側窓が開閉される。巻き取り棒３の両端部には巻き取り棒３を支持する巻き取り棒支持ベルト４の下端部が固定され、巻き取り棒支持ベルト４の上端部はビニールハウス１の構造物に固定されて、巻き取り棒３がずり落ちないよう支持している。巻き取り棒３が上昇してビニールハウス１の側窓が全閉されたときに側窓の上部に位置する巻き取り棒３を覆うことが可能な覆い部５がビニールウス１の側面上端部に設置されている。【選択図】図１
