PROBLEM TO BE SOLVED: To replace a blood flow rate sensor sandwiching a blood vessel in a blood flow rate probe for measuring the blood flow rate of a blood vessel of a subject such as a human body, so that the blood flow rate of a blood vessel having a wide range of thickness can be obtained by one blood flow rate probe. Can be measured. A blood flow rate sensor (10) that generates an electrical signal according to the blood flow rate by sandwiching a part of the blood vessel of the subject in the longitudinal direction from the outer circumference, and a blood flow rate by processing the electrical signal from the blood flow rate sensor (10). Blood flow rate measuring device 20 for converting into an electric signal representing The blood flow sensor 10 and the blood flow measuring device 20 respectively include connectors 13 and 23 that are mechanically and electrically connectable to each other so as to be separable from each other. [Selection diagram] Figure 1【課題】人体等の被検体の血管の血流量を測定する血流量プローブにおいて、血管を挟む血流量センサを交換可能とすることにより、一つの血流量プローブで広範囲の太さの血管の血流量を測定可能とする。【解決手段】被検体の血管の長手方向の一部を外周から挟んで血流量に応じた電気信号を発生する血流量センサ１０と、該血流量センサ１０からの電気信号を処理して血流量を表す電気信号に変換する血流量測定器２０とを備える。血流量センサ１０及び血流量測定器２０は、機械的及び電気的に互いを切り離し可能に接続するコネクタ１３、２３をそれぞれ備える。【選択図】図１
