In a blood flow probe for measuring the blood flow of a blood vessel of a subject such as a human body, the blood flow sensor of a wide range of thicknesses can be obtained with one blood flow probe by making it possible to replace a blood flow sensor sandwiching the blood vessel. Can be measured. A blood flow sensor for generating an electrical signal corresponding to a blood flow by sandwiching a part of a blood vessel of a subject in the longitudinal direction from the outer periphery, and processing the electrical signal from the blood flow sensor to process the blood flow. And a blood flow rate measuring device 20 for converting into an electrical signal representing the above. The blood flow sensor 10 and the blood flow measuring device 20 include connectors 13 and 23 that are mechanically and electrically connected to each other so as to be separated from each other. [Selection] 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
