Provided is a magnetic member comprising a plurality of superparamagnetic particles held by the magnetic member, wherein each of the plurality of superparamagnetic particles is formed with a particle diameter prescribed so that at least the Neel relaxation time (tn) of each of the superparamagnetic particles is shorter than the cycle (P) of the AC magnet field to be applied to the magnetic member when the magnetic member is to be used as an electronic part (tn < P).
