PROBLEM TO BE SOLVED: To substantially improve detection sensitivity without the need for using dynamic displacements of a detector. SOLUTION: In this magnetic susceptibility measuring device for measuring the magnetic susceptibility of a sample through the use of magnetic resonance phenomena, distortion of a magnetic field is measured from magnetic resonance signals when an object to be measured 2 is arranged and not arranged in the vicinity of magnetic resonant matter 2, and the magnetic susceptibility is obtained from the distortion of the magnetic field and the shape of the object to be measured 2.
