And Ferro interferometer, - the present invention, a Fabry that spacing is provided, and the refractive index and the phase change is larger fiber having compared to the air gap between the two mirrors of the first mirror and the second mirror are parallel to each other in a state It is connected directly without the air gap to the second mirrors of the Fabry interferometer comprising a diaphragm which is the external pressure is applied-Perot interferometer relates to a pressure sensor. A pressure sensor of the present invention, an optical fiber is provided between the two mirrors in order to accurately measure the pressure applied to the diaphragm from the outside. Also the pressure sensor of the present invention comprises the insertion structure and the protective structure of a material harmless to the human body to the diaphragm in order to be able to measure the pressure in a living body by injection. In another aspect, the present invention is an electrical signal is combined with the pressure sensor, the optical emitted light to the pressure sensor and the output from the optical converter and the optical converter and outputting the received light coming from the sensor into an electrical signal and a microprocessor to save processing to output an electric signal to the display, to a pressure measuring device further comprising a display for output to the display for receiving the electrical signal.
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