To provide a hydroponic cultivation apparatus provided with a water level adjusting apparatus having a simple structure and a structure that does not hinder circulating water flow. A hydroponic cultivation apparatus is provided with a plurality of cultivation pipes that are inclined stepwise horizontally or slightly downstream on a periphery of a triangular mounting base in front view, and a water supply pipe is provided on the uppermost cultivation pipe of the cultivation pipe, In a hydroponic cultivation device that connects a drainage pipe to the bottommost cultivation pipe and connects the upstream cultivation pipe and the downstream cultivation pipe with connecting pipes so that the liquid fertilizer circulates, the lid body at both ends of the cultivation pipe 7 is connected to a water level adjustment cap 6 having an opening neck 8 at the center. As a result, the structure is simple, and the liquid fertilizer water level can be easily adjusted without obstructing the circulating water flow of the liquid fertilizer. [Selection] Figure 3【課題】構造が簡単であり、かつ循環流水の障害とならない構造の水位調節装置を設けた水耕栽培装置を提供する。【解決手段】水耕栽培装置は、正面視三角形状の取付台の周囲に階段状に水平又は下流側にやや傾斜した栽培パイプを複数個設け、栽培パイプの最上部の栽培パイプに給水管、最下部の栽培パイプに排水管を接続し、かつ液肥が循環するように上流側の栽培パイプと下流側の栽培パイプをそれぞれ連結パイプで接続する水耕栽培装置において、栽培パイプの両端に蓋本体７の中央部分に開口首８を設けた水位調節キャップ６を接続するものである。これにより、構造が簡単であり、かつ液肥の循環流水の障害とならず、液肥の水位調節を簡単に行うことができる。【選択図】図３
