To provide a hydroponic device in which: a cultivation bed is cultivated by being floated on culture fluid for easy movement； a root of a cultivated product can take in nutrient and oxygen dissolved in the culture fluid and also directly take oxygen in by the contact of air； and the cultivation bed can be used repeatedly by irradiation cut of cultivation light to the culture fluid to repress algae propagation.SOLUTION: A cultivation bed 50 is formed by connecting a plurality cultivation palettes 53 in a caterpillar state in which the cultivation palette includes: a planting component 51 length of which is a length to cover an upper side of both side wall parts of a cultivation tank 10； and float part 52 which is arranged at the lower face of the planting component 51, regulated by the side wall part of the cultivation tank 10 not to float in a short direction of the cultivation tank 10, and a part of which sinks in culture fluid. The cultivation bed is a continuum formed by integrating the cultivation palettes 53 connected in the caterpillar state, and the cultivation bed is suspended around a pair of guide wheels 56, 57 at both sides of the cultivation tank 10 in the longer direction to be installed around the upper side of the cultivation tank 10, the lower side thereof, and both sides thereof in the longer direction.SELECTED DRAWING: Figure 1【課題】栽培床を移動容易に培養液に浮かべて栽培し、栽培物の根が、培養液中に溶存する養分と酸素を摂取できさらに接触空気から酸素を直接摂取でき、栽培光の培養液への照射をカットし藻の繁殖を無くして栽培床の反復使用が可能である水耕栽培装置を提供する。【解決手段】栽培床５０は、栽培槽１０の両側の側壁部の上方に被さる長さを有する定植部材５１と、定植部材５１の下面に設けられ栽培槽１０の短手方向に浮動しないように栽培槽１０の側壁部により規制され一部が培養液中に沈む浮子部５２と、を有する複数の栽培パレット５３をキャタピラー状に接続されてなり、かつキャタピラー状に接続された複数の栽培パレット５３の一体形の連続体であり、栽培槽１０の長手方向の両側に備える一対のガイド輪５６，５７に架けられ栽培槽１０の上側と下側および長手方向の両側を取り巻いて設けられる。【選択図】図１
