Superconducting magnet device

The present invention addresses the problem of shortening the time required for repairing a superconducting magnet device from a sudden stop. This superconducting magnet device (10) is provided with: a plurality of superconducting coil excitation circuits (30) that are each provided with a superconducting coil (32) and an excitation power source (34) thereof, and that can operate independently from each other; a plurality of sudden stop detectors (50) for detecting the sudden stop of the superconducting coil (32) of the corresponding superconducting coil excitation circuit (30); and a controller (60) that, when at least one of the plurality of sudden stop detectors (50) detects a sudden stop, controls the excitation power source (34) of the superconducting coil excitation circuit (30) so as to demagnetize the superconducting coil (32) of the superconducting coil excitation circuit (30) from among the plurality of superconducting coil excitation circuits (30) in which the sudden stop is not detected. 本发明的课题在于缩