Problem to be solved: to provide a water tank connecting member capable of switching water storage and drainage of the nutrient solution in accordance with each step of hydroponics and a hydroponic tank structure using the same.A first connecting portion, a second connection portion, and a drain port, and a water tank connection member for connecting the harvest work water tank to the rear end portion of the hydroponic tank, and the first connection portion and the second connection portion are disposed substantially opposite, and the second connection portion is higher than the first connection portion It is characterized in that the drain port is disposed between the first connection portion and the second connection portion.Diagram【課題】水耕栽培の各工程に応じて養液の貯水及び排水を切替えることが可能な水槽接続部材及びこれを用いた水耕栽培用水槽構造を提供する。【解決手段】第一接続部と、第二接続部と、排水口と、を具備し、水耕栽培用水槽の後端部に収穫作業用水槽を接続するための水槽接続部材であって、前記第一接続部と前記第二接続部が、略対向して配設され、前記第二接続部が、前記第一接続部より高い位置に配設され、前記排水口が、前記第一接続部と前記第二接続部の間に配設されていること、を特徴とする。【選択図】図１
