PROBLEM TO BE SOLVED: To provide a facility for plant growth which can maintain the environment where plant is raised in the condition of suitable temperature and high carbon dioxide concentration in a facility using sunlight.SOLUTION: The facility for plant growth includes: a greenhouse 2 using sunlight； and a growing chamber 10 which is prepared in the greenhouse 2, and raises a plant P in the condition that the plant P is held. The growing chamber 10 includes: a covering part 11 which is prepared so that the plant P may be surrounded, and consists of a light transmission nature member； and a carbon dioxide supply means which is arranged in the covering part 11, and supplies carbon dioxide in the covering part 11. In the covering part 11, a ventilation part for ventilating air in the covering part 11 and air of the greenhouse 2 is prepared, and the humidity of air in the covering part 11 is maintained higher than the humidity of air of the greenhouse 2. If the inside of the covering part 11 is ventilated, heat more than heat supplied into the covering part 11 can be made to discharge outside, and thereby the inside of the covering part 11 can be maintained at the atmospheric temperature which can grow the plant P even in the summer or the like with much solar radiation.【課題】太陽光を利用する施設において、植物を育成する環境を適切な温度かつ高二酸化炭素濃度の状態に維持することができる植物育成用施設を提供する。【解決手段】太陽光を利用する温室２と、温室２内に設けられた、植物Ｐを収容した状態で植物Ｐを育成する育成室１０と、を備えており、育成室１０は、植物Ｐを囲むように設けられた、光透過性部材からなる被覆部１１と、被覆部１１内に配置された、被覆部１１内に二酸化炭素を供給する二酸化炭素供給手段とを備えており、被覆部１１には、被覆部１１内の空気と温室２の空気とを換気するための換気部が設けられており、被覆部１１内の空気の湿度が、温室２の空気の湿度よりも高く維持されている。被覆部１１内が換気されると、被覆部１１内に供給される熱以上の熱を外部に排出させることができるから、日射量の多い夏場などあっても、被覆部１１内を植物Ｐが生育可能な気温に維持することができる。【選択図】図１
