A blood flow measuring apparatus includes: a module which is configured to emit radiation to an object to be measured and receive reflection of the radiation, to detect movement of the object to be measured based on a Doppler effect a reflective holding member which internally hold the module with a gap from an abutment surface that is to be butted against a skin, and which includes a reflective member covering the module and configured to reflect the radiation and a process circuit which is configured to receive an output from the module, and which is configured to perform at least a process related to a blood flow speed.
