PROBLEM TO BE SOLVED: 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 60 is given in which: a raw fabric roll R winding a cultivation bed sheet 60 which is an integrated continuum consisting of a cellular cushioning material 61 and a shading sheet 62, a width dimension of which is a largeness for allowing it to abut with both side wall parts of a cultivation tank 10B, in which planting holes 63 are formed in the approximately center of width in the width direction and at a required pitch in the lengthwise direction, is arranged to unwind outwardly at one end in the longer direction of the cultivation tank 10B； and the raw fabric roll R is unwound so that the cultivation bed sheet 60 is introduced into the cultivation tank 10B so that the cellular cushioning material 61 becomes the bottom side to be floated in a culture fluid and to be outwardly extended to the other end of the cultivation tank 10B in the longer direction to be wounded.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【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６０は、気泡緩衝材６１と遮光性シート６２とからなる一体形の連続体であり、幅寸法が、栽培槽１０Ｂの両側の側壁部に接する大きさであり、定植孔６３が、幅方向の中程にかつ長さ方向に所要ピッチで開けられた栽培床用シート６０を巻いてなる原反ロールＲを、栽培槽１０Ｂの長手方向の一端外方に巻き解けるように設置し、原反ロールＲを巻き解いて気泡緩衝材６１が下側になるように栽培床用シート６０を栽培槽１０Ｂ内に導いて培養液中に浮かばせ、栽培槽１０Ｂの長手方向の他端外方まで延ばして巻き取るように構成されている。【選択図】図１
