PROBLEM TO BE SOLVED: To improve a ventilation device to prevent a moving member from inclining to a guide pillar and being like a pothhook, thereby stopping the movement of a drive machine.SOLUTION: The ventilation device includes an openable sheet 1 that opens/closes an opening O formed to a greenhouse H and is hung on the greenhouse H, a winding shaft 2 that winds up and off the openable sheet 1, the drive machine 3 that rotates the winding shaft 2, and the guide pillar 4 to which the drive machine 3 is movably installed along an axial direction. The drive machine 3 is composed of a drive machine body 30 that is connected with an end of the winding shaft 2 and rotates of the winding shaft 2, and the moving member 31 that is movable along the guide pillar 4. The drive machine 3 moves along the guide pillar 4 along with the winding up and off of the openable sheet 1. In the ventilation device, the drive machine body 30 is connected with the moving member 31 swingably.【課題】 換気装置の改良に関し、移動部材がガイド柱に対して傾いて自在鉤のようになり駆動機が動かなくなることを防止する。【解決手段】 温室Ｈに形成される開口Ｏを開閉し温室Ｈに吊設される開閉シート１と、この開閉シート１を巻き取り、巻き戻す巻き上げ軸２と、この巻き上げ軸２を回転する駆動機３と、この駆動機３が軸方向に沿って移動可能に取り付けられるガイド柱４とを備える換気装置であって、駆動機３が巻き上げ軸２の一端に連結されてこの巻き上げ軸２を回転する駆動機本体３０と、ガイド柱４に沿って移動可能な移動部材３１とからなり、開閉シート１の巻き取り、巻き戻しに伴って駆動機３がガイド柱４に沿って移動する換気装置において、駆動機本体３０が移動部材３１に揺動可能に連結される。【選択図】 図２
