PROBLEM TO BE SOLVED: To provide a magnetic fluid-detecting apparatus capable of detecting a magnetic fluid with high precision, by effectively filtering magnetic noises.SOLUTION: A magnetic fluid-detecting apparatus includes: one or more magnets for exciting a magnetic fluid staying within a body a plurality of magnetic sensor for detecting magnetic signals generated by the magnetic fluid excited by the magnets an oscillating unit for oscillating them a reference signal-generating part arranged opposite to a magnetic sensor detection side and comprising a paramagnet and a detector for detecting the magnetic fluid by getting the difference among outputs from the plurality of magnetic sensors.
