PROBLEM TO BE SOLVED: To provide a plant cultivation device and plant cultivation method capable of realizing reduction of the amount of electricity usage, uniformizing the quality of target plant, and having excellent yield efficiency.SOLUTION: A plant cultivation device 1 comprises multi-level hydroponic cultivation facility 3 constructed by vertically piling 2 or more cultivation panels 4 in a cultivation facility 2 capable of taking sunlight thereinto. Onto the cultivation panels 4 other than the highest level panel in the facility 3, the sunlight is partially radiated. Furthermore, an illumination device 7 is arranged at the lower part of each level other than the lowest level in the facility 3. On the highest cultivation panel 4 in the facility 3, hydroponic cultivation of a target plant 10 is carried out by virtue of irradiation of sunlight. On each of the cultivation panels 4 other than the highest level panel in the facility 3, hydroponic cultivation of the target plant 10 is carried out by virtue of irradiation of sunlight and artificial light provided by the illumination device 7.【課題】電気使用量の低減を図りながら、対象植物の品質を均一化でき、収穫効率にも優れる植物栽培装置および植物栽培方法を提供する。【解決手段】植物栽培装置１は、太陽光を取り込み可能な栽培施設２内に、上下方向に栽培パネル４を２段以上に重ねて構成される多段化水耕栽培設備３を設置してなり、設備３の最上段以外の栽培パネル４上にも太陽光が一部入り込む構造であり、かつ、設備３の最下段以外の各段下部に照明装置７が設置されており、設備３の最上段の栽培パネル４には、太陽光が照射されて対象植物１０の水耕栽培が行なわれ、設備３の最上段以外の各段の栽培パネル４には、太陽光と照明装置７による人工光とが照射されて対象植物１０の水耕栽培が行なわれる。【選択図】図１
