PROBLEM TO BE SOLVED: To provide a fluid pressure measuring apparatus which facilitates calibration without using the other pressure gauges when measuring fluid pressure of an object to be measured, especially fluid pressure in vivo, that is, measuring the pressure of blood flow (blood pressure).SOLUTION: The fluid pressure measuring apparatus includes at least two measuring parts 6 and 8, wherein the fluid velocity in and the diameter of the conduit which is inside a measured part are measured, the change amount of the conduit, the difference of the conduit diameters between one measuring part and the other measuring part, and the difference of the maximum value and the minimum value of the fluid pressure is obtained on the basis of the distance between the two measuring parts 6 and 8 which leads to water head difference, the coefficient is obtained on the basis of the difference value and the flow velocity value and the diameter value of the one or the other measuring part 6 or 8 so that the pressure of the fluid flowing in the conduit is obtained.
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