Problem to be solved: to provide a drip monitoring sensor capable of detecting a liquid column state of a liquid falling inside the drip tube.A drip monitoring sensorA drip monitoring sensor for monitoring a liquid falling inside the drip tube；A light emitting portion capable of irradiating an incident light toward the liquidThe incident light can be received by reflected light reflected by the liquid.A light receiving portion capable of receiving a light receiving light beam having a blunt angle in the same plane as the light emitting ray of the light emitting part and a light receiving portion capable of receiving a light receiving light beamBased on the received light signal from the light receiving portionA liquid column detecting portion for detecting a liquid column state of said liquid.Diagram【課題】点滴筒の内部を落下する液体の液柱状態を検出可能な点滴監視センサを提供する。【解決手段】点滴監視センサは、点滴筒の内部を落下する液体を監視する点滴監視センサであって、前記液体に向けて入射光を照射可能な発光部と、前記入射光が前記液体により反射されて生じる反射光を受光可能であり、前記発光部の発光光線と同一平面内で鈍角を形成する受光光線を受光可能な受光部と、前記受光部からの受光信号に基づいて、前記液体の液柱状態を検出する液柱検出部と、を備える。【選択図】図４
