PROBLEM TO BE SOLVED: To provide a hydroponic device which has a culture space suitable for each of plural plant bodies different from each other in sizes.SOLUTION: A hydroponic device 15 comprises: a plant support part 1 for supporting a plurality of plant bodies 8s, 8m, 8l, 8xl in a manner that the plurality of plant bodies 8s, 8m, 8l, 8xl form a row； a frame body 10 serving as a culture chamber, in which the plant support part 1 is provided, and which includes an underground space 3 where underground parts of the plurality of plant bodies 8s, 8m, 8l, 8xl grow and a ground space 4 where above-ground parts of the plurality of plant bodies 8s, 8m, 8l, 8xl grow； nutritious liquid supplying parts 5 for supplying nutritious liquid to the underground parts of the plurality of plant bodies 8s, 8m, 8l, 8xl； and a nutritious liquid discharging part 6 configured to discharge nutritious liquid from the underground space 3. The heights D1, D2, D3, D4 of the underground space 3 get larger gradually along a row direction K in which the row extends.【課題】大きさが異なる複数の植物体のそれぞれに適した栽培空間を有する水耕栽培装置を提供する。【解決手段】水耕栽培装置１５は、複数の植物体８ｓ，８ｍ，８ｌ，８ｘｌが列を形成するように複数の植物体８ｓ，８ｍ，８ｌ，８ｘｌを支持するための植物支持部１と、植物支持部１がその内部に設けられ、複数の植物体８ｓ，８ｍ，８ｌ，８ｘｌの地下部が成長する地下空間３と複数の植物体８ｓ，８ｍ，８ｌ，８ｘｌの地上部が成長する地上空間４とを内包する栽培室筐体１０と、複数の植物体８ｓ，８ｍ，８ｌ，８ｘｌの地下部に養液を供給するための養液供給部５と、地下空間３から養液を排出するように構成された養液排出部６と、を備え、地下空間３の高さＤ１，Ｄ２，Ｄ３，Ｄ４が、列が延びる列方向Ｋに沿って徐々に大きくなる。【選択図】図１
