PROBLEM TO BE SOLVED: To provide a hydroponic cultivation device that can reduce differences in growth speed and growth level among objects to be cultivated when a plurality of objects to be cultivated is cultivated at the same time.SOLUTION: The hydroponic cultivation device includes: a holding member 1 for holding the object 5 to be cultivated； an oxygen supply unit 2 for supplying oxygen into water to dissolve oxygen in the water； a moving device 3 for moving the holding member 1 between a position where the water can be supplied to the object 5 to be cultivated held in the holding member 1 and a position the water cannot be supplied to the object 5 to be cultivated held in the holding member 1； and a supply state changing device 4 that can change either a direction in which the water is supplied to the object 5 to be cultivated held in the holding member 1, or a position at which the water is supplied to the object 5 to be cultivated.【課題】複数個の育成対象物を同時に育成する場合に、育成対象物間に生じる発育速度及び発育の良さの差異を低減することができる水耕栽培装置を提供する。【解決手段】水耕栽培装置は、育成対象物５を保持する保持用部材１と、水に酸素を供給することでこの水に酸素を溶解させる酸素供給手段２と、前記保持用部材１を、前記保持用部材１に保持されている前記育成対象物５へ前記水が供給され得る位置と、前記保持用部材１に保持されている前記育成対象物５へ前記水が供給され得ない位置との間で、移動させ得る移動手段３と、前記保持用部材１に保持されている前記育成対象物５への前記水が供給される方向と、前記育成対象物５への前記水が供給される位置とのうち、少なくとも一方を変更し得る供給状態変更手段４とを備える。【選択図】図１
