PROBLEM TO BE SOLVED: To sufficiently secure cultivation space in a greenhouse without increasing a height of the greenhouse to streamline a cultivation work so that construction cost of the greenhouse and installation cost of a curtain opening/closing device are reduced.SOLUTION: An curtain opening/closing device for a greenhouse comprises: a plurality of guide members which are stretched over almost the whole length of the greenhouse adjacent to inner surfaces of arch-shaped members and parallel to a ridge direction； a leading member which is fixed to a drive wire and is moved orthogonal to the guide member in the ridge direction on the guide member by driving of the drive wire； a drive shaft which is disposed along one of gable surfaces of the greenhouse and includes a rotation drum to drive the driving wire； and a curtain member of which tip part is fixed to the leading member and base end part is fixed to a fixing member extended along the inner surface of the arch-shaped member, and which expands/contracts to open/close by movement of the leading member. The curtain member is moved along the inner surface of the arch-shaped member in the greenhouse making a point right under the ridge pole as the maximum height point to maximize cultivation space in the greenhouse.【目的】温室の高さを高くすることなく、温室内の栽培空間を十分に確保して栽培作業を効率化し、温室の建設コストとカーテン開閉装置の設置コストを低減すること。【構成】アーチ状部材の内面に近接して温室の略全長に亘って、棟方向に平行して複数本掛け渡された案内部材と、駆動ワイヤに固定されその駆動により案内部材に直交して該部材上を棟方向に移動する先導部材と、温室の一方の妻面に沿って配設され、駆動ワイヤを駆動するための回転ドラムを備えた駆動軸と、先端部が前記先導部材に基端部が前記アーチ部材の内面に沿って延びる固定部材に固着され、前記先導部材の移動により伸縮して開閉されるカーテン部材と、から構成され、カーテン部材は、棟木直下を最高点として温室のアーチ状部材内面に沿って移動して、前記温室の内部の栽培空間が最大化された、温室のカーテン開閉装置。【選択図】図１
