PROBLEM TO BE SOLVED: To easily switch between a low humidity environment and a high humidity environment.SOLUTION: A plant cultivation device has a cultivation container (20) that stores a plant (P) of a cultivation object, an illumination device (30) that irradiates the plant (P) with light, and a moisture-proof sheet (40) that can be switched between a moisture retention position for retaining the moisture of a cultivation space (G) that is a space in which the plant (P) is cultivated and a ventilation position for opening the cultivation space (G) to the outside.SELECTED DRAWING: Figure 3【課題】低湿度環境と高湿度環境とを容易に切り替える。【解決手段】栽培対象の植物（Ｐ）を収容する栽培容器（２０）と、前記植物（Ｐ）に光を照射する照明装置（３０）と、前記植物（Ｐ）が栽培される空間である栽培空間（Ｇ）を保湿するための保湿位置と、前記栽培空間（Ｇ）を外部に開放する換気位置とに切り替え可能に備えられた防湿シート（４０）とを備える。【選択図】図３
