To provide a plant cultivation device that can efficiently capture an image of the overall coverage state of a target population.SOLUTION: A plant cultivation device has: an irradiation body L that irradiates, with irradiation light, a target population composed of a plurality of plants, in cultivation plants planted in a line of ridge； imaging means Ca that captures an image of the target population which has been irradiated by the irradiation body L； and a determination part that determines a coverage area that is an area of thick coverage of the population, in an image captured with the imaging means Ca.SELECTED DRAWING: Figure 16【課題】対象群落の全体的な繁茂状態を効率よく撮像可能な植物栽培装置を提供する。【解決手段】一列の畝に植えられた栽培植物のうち、複数の株から構成される対象群落に照射光を照射する照射体Ｌと、照射体Ｌによって照射された対象群落を撮像する撮像手段Ｃａと、撮像手段Ｃａによって取得された撮像画像のうち、対象群落における繁茂状態の領域である被覆領域を判別する判別部と、が備えられている。【選択図】図１６
