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Due to the optical fiber have a small diameter and it can propagate light efficiently, it is possible to realize ultra‐compact remote sensors. We have invented to the fiber‐optic pressure sensor utilizes magneto‐optical effect with polarized light, ring‐type interferometer and a magnetic material, in order to propose the pressure measurement system which can measure in vivo or in harsh environments. We have confirmed that the prototype sensor based on magneto‐optical effect was possible to detect pressures in range of −4 to +40 kPa.