To provide a water culture water tank capable of preventing cutoff of a channel in a tank caused by extension of a root following to growth of plant for maintaining flowing property of a nutritious liquid, enhancing rigidity in whole body, and facilitating connection by using a joint.SOLUTION: There is provided a water culture water tank formed of a long sized trough member comprising a bottom with steps formed inside, in which a protrusion-shaped or hollow shaped rib is formed on an upper part of a side part.SELECTED DRAWING: Figure 1【課題】植物の成長に伴う根部の広がりに起因する槽内部の流路の止水を防止して養液の流水性を維持し、全体の剛性を高めつつ、継手を用いて簡便に接続することができる水耕栽培用水槽を提供することを目的とする。【解決手段】内側に段差を形成した底部を具備する長尺樋部材で構成され、側部の上方部に突起形状又は中空形状のリブを具備すること、を特徴とする水耕栽培用水槽。【選択図】図１
