PROBLEM TO BE SOLVED: To ensure that water quality in an aquaculture water tank can be grasped at low cost.SOLUTION: An aquaculture water tank water quality monitoring device includes: a moving body 20 that can move in an aquaculture water tank 10； a plurality of water quality sensors 30 that are arranged in the moving body 20 and measure a state of water； transmission means (a transmission antenna 40) that transmits measured values of the water quality sensors 30； measurement means (a moving body position detection camera 50 and a hydrophone 52) that measures a position of the moving body 20 in the aquaculture water tank 10； and means (a data recording device 60) that determines a water quality measurement position in the aquaculture water tank 10 from the position of the moving body 20 and positions of the water quality sensors 30 included in the moving body 20.SELECTED DRAWING: Figure 1【課題】低コストで養殖水槽内の水質を把握できるようにする。【解決手段】養殖水槽１０内を移動可能な移動体２０と、該移動体２０に配設された、水の状態を計測する複数の水質センサ３０と、該水質センサ３０の測定値を送信する送信手段（送信アンテナ４０）と、前記移動体２０の前記養殖水槽１０内での位置を測定する計測手段（移動体位置検出用カメラ５０、水中マイクロフォン５２）と、前記移動体２０の位置と該移動体２０に備えた前記水質センサ３０の位置から前記養殖水槽１０内での水質測定位置を求める手段（データ記録装置６０）と、を備える。【選択図】図１
