PROBLEM TO BE SOLVED: To provide a hydroponic apparatus that can perform hydroponics under cultivation optimal temperature of energy-saving and low operation cost, and has a simple apparatus configuration and a low operation cost.SOLUTION: A hydroponic apparatus 1 has a plurality of cultivation shelves 101, 102, 103 for hydroponics, and supplies nutritious liquid from a nutritious liquid storage tank 13 to each of the cultivation shelves. The apparatus has: shielding means 15, 16 for shielding each of the cultivation shelves from outside air； nutritious liquid temperature control means for adjusting temperature of nutritious liquid in the nutritious liquid storage tank； nutritious liquid circulation means 11, 14 for sending nutritious liquid from the nutritious liquid storage tank to supply the liquid to each of the cultivation shelves, and returning the liquid to the nutritious liquid storage tank； and heat exchange means which is provided corresponding to each of the cultivation shelves, and performs heat exchange to the nutritious liquid to bring the temperature of each of the cultivation shelves to predetermined temperature.SELECTED DRAWING: Figure 1【課題】省エネルギーかつ低運転コストの栽培適温下で水耕栽培をすることができ、かつ、装置構成も簡単で運転コストも低廉な水耕栽培装置を提供する。【解決手段】水耕栽培用の栽培棚１０１、１０２、１０３を複数有し、養液貯留槽１３から各前記栽培棚に養液を供給する水耕栽培装置１において、前記栽培棚のそれぞれを外気から遮蔽する遮蔽手段１５、１６と、前記養液貯留槽の養液の温度を調整する養液温度調整手段と、前記養液貯留槽から養液を送出し、前記栽培棚のそれぞれに供給して、前記養液貯留槽に戻す養液循環手段１１、１４と、前記栽培棚のそれぞれに対応して設けられ、前記養液との間で熱交換を行って各栽培棚の温度を予め設定された温度にする熱交換手段とを有する。【選択図】図１
