PROBLEM TO BE SOLVED: To provide a water level adjusting device capable of: working with mechanical mechanism requiring no manual operation and no power supply being established on paddy field and adjusting water level of paddy field having a compact size and a low projecting height from ridge of the paddy field in a predetermined range.SOLUTION: A water level adjusting device comprises: a housing comprising a first opening part communicating to the side of irrigation ditch and a second opening part communicating to the side of area for retarding water a float arranged inside of the housing and on the side of the second opening part in a manner slidable in approximately vertical direction a valve attached via a pivoting axis arranged near the first opening part of the housing, and being able to open and close on the side of the first opening part of the housing a first rod-like member which is rotatably arranged around fulcrum arranged between the float and the valve as an axis, whose one end is movably jointed to the float, and whose the other end is movably jointed to the valve and having approximately L-shape. The water level adjusting device has function that the valve opens or closes together with sliding of the float in vertical direction.COPYRIGHT: (C)2014,JPO&INPIT【課題】 人手や電源を必要とせず、機械的機構のみで作動し、水田に設置が可能で、かつ、コンパクトで、水田の畔から突出する高さが低い、水田の水位を一定範囲で調整可能な水位調整装置を提供する。【解決手段】 用水路側に連通する第一の開口部と、遊水区域側に連通する第二の開口部を備える筐体と、前記筐体の第二の開口部側の内部に、略鉛直方向に摺動可能に設けられたフロートと、前記筐体の前記第一の開口部近傍に設けられた回動軸を介して取り付けられ、前記筐体の前記第一の開口部側に開閉可能な弁と、前記フロートと前記弁の間に設けられてなる支点を軸として回動可能に設けられ、一方の端が前記フロートに可動状態で接合され、他方の端が前記弁に可動状態で接合されてなる略L字形状を有する第一の棒状部材とで、前記フロートの鉛直方向の摺動に伴い、前記弁が開閉する機能を有する水位調整装置を構成する。【選択図】図1
