PROBLEM TO BE SOLVED: To provide a hydroponics apparatus capable of adjusting cultivation environment corresponding to each of plants which are cultivated at the same time even if growth states of the plants are different.SOLUTION: A hydroponics apparatus comprises: a raising period measurement part 32 which measures growth periods of plants P1, P2； a plurality of nutritious liquid storage parts 12A, 12B which store nutritious liquid 100A, 100B at least either component or concentration of which is different from each other； a plurality of cultivation tanks 11A, 11B which cultivate the plants； pumps 14A, 14B which supply nutritious liquid from the nutritious liquid storage parts to the cultivation tanks； and a determination/control part 31 which, in the case where a raising period of plants cultivated by the cultivation tanks is determined to have shifted from a first raising period to a second raising period, switches nutritious liquid supplied from nutritious liquid storage parts to cultivation tanks by a nutritious liquid supply part from nutritious liquid stored in any nutritious liquid storage part to nutritious liquid stored in another nutritious liquid storage part.【課題】同時に栽培する植物の生長状態が異なる場合であっても、それぞれの植物に応じて栽培環境を調整できる水耕栽培装置を提供する。【解決手段】植物Ｐ１、Ｐ２の育成期間を計測する育成期間計測部３２と、成分又は濃度の少なくとも一方がそれぞれ異なる養液１００Ａ、１００Ｂを貯蔵する複数の養液貯蔵部１２Ａ、１２Ｂと、植物を栽培する複数の栽培槽１１Ａ、１１Ｂと、養液貯蔵部から栽培槽に養液を供給するポンプ１４Ａ、１４Ｂと、栽培槽によって栽培されている植物の育成期間が第１育成期間から第２育成期間に移行したと判定された場合に、養液供給部により養液貯蔵部から栽培槽に供給する養液を、何れかの養液貯蔵部に貯蔵した養液から他の養液貯蔵部に貯蔵した養液に切り替える判定／制御部３１とを備える。【選択図】図１
