PURPOSE: To provide a superconducting magnet device, for unclear magnetic resonance apparatus use, which can adjust an irregular magnetic field while the strength of magnetic field in maintained and an external leakage magnetic field is reduced.

CONSTITUTION: A superconducting magnet device for unclear magnetic resonance apparatus use is featured as follows: one part of a first superconducting coil group 1 and one part of a second superconducting coil group 3 are connected electrically in series to form one circuit; and said circuits in the prescribed number are assembled in parallel to constitute a magnet. According to this invention, the electric current value of the individual circuits can be controlled independently of each other, and it is possible to adjust an irregular magnetic field which is caused by a manufacturing tolerance or by a difference in installation surroundings.