PROBLEM TO BE SOLVED: To suppress electromagnetic deformation of a radiation shield at the time of rapid demagnetization and a vibration error magnetic field caused by a leak magnetic field of a gradient magnetic field coil at the time of imaging at the same time.SOLUTION: The superconductive magnet device includes: a superconductive coil having a superconductive wire wound thereon a refrigerant container enclosing at least one superconductive coil a radiation shield covering the refrigerant container a vacuum container covering the radiation shield and the gradient magnetic field coil generating a gradient magnetic field in the imaging space. A part in the circumferential direction of the radiation shield is replaced with a member with higher resistance than periphery to make a composite material with a low-resistance member, and the position of the high-resistance area is in the intermediate direction between an X-direction gradient magnetic field axis and a Y-direction gradient magnetic field axis where leak magnetic fields from the gradient magnetic field coil are few.
