PROBLEM TO BE SOLVED: To provide a hydroponic cultivation device capable of increasing the yield of new tubers. A hydroponic cultivation device 2 has at least one stem through which at least one main stem 15 of a plant 1 passes. A ground surface portion 24 having a through hole 24a for a root and a support portion 25 having at least one through hole 25a for a root through which at least one root 13 extending from the seed tuber 16 passes, and at least one through hole for a stem is provided. The hole 24a and the at least one root through hole 25a are provided at positions displaced from each other so as not to overlap each other in plan view. [Selection diagram] Figure 1【課題】新たな塊茎の収穫量を増加させることができる水耕栽培装置を提供する【解決手段】水耕栽培装置２は、植物１の少なくとも１つの主茎１５がそれぞれ通過する少なくとも１つの茎用貫通孔２４ａを有する地表面部２４と、種塊茎１６から延びる少なくとも１つの根１３がそれぞれ通過する少なくとも１つの根用貫通孔２５ａを有する支持部２５と、を備え、少なくとも１つの茎用貫通孔２４ａと少なくとも１つの根用貫通孔２５ａとは、平面視において、互いに重ならないように、ずれた位置に設けられている。【選択図】図１
