PROBLEM TO BE SOLVED: To provide a plant cultivation device capable of changing its size easily according to growth of a plant stored inside the device.SOLUTION: In a plant cultivation device 1, a plurality of support attaching parts 12, 13, 312, and 323, to which a support 40 for coupling a placing stage 10 for placing a plant 101 and a ceiling part 30 is attached, are provided in the placing stage 10 and the ceiling part 30. At least one of the support 40 and the support attaching parts 12, 13, 312, and 323, to which the support 40 is attached, is selected according to the growth degree of the plant, and the ceiling part 30 and the placing stage 10 are coupled. Change of the capacity between the ceiling part 30 and the placing stage 10 is made possible.
