Provided is an MRI apparatus capable of reducing the period and cost required for magnetic field adjustment. To this end, a current with a rated current value flows through the superconducting coil of the static magnetic field generator, and the nonuniformity of the static magnetic field distribution in the imaging space is measured in the state where the rated static magnetic field B_r is generated, and the measured static magnetic field distribution , Calculates the distribution of the correcting magnetic field to be generated by the correcting magnetic field generating section disposed in the vicinity of the imaging space by computation and sets the current value of the superconducting coil to a predetermined (greater than 0) lower than the rated current value The current is reduced to the current value so that a current with a low current value flows through the superconducting coil and the correcting magnetic field of the correcting magnetic field generating section is set to the correcting magnetic field obtained by calculation in a state in which the low static magnetic field B_low is generated And repeats this to reduce static magnetic field inhomogeneity.磁場調整に要する期間ならびに費用を低減することのできるMRI装置を提供する。そのために、静磁場発生装置の超電導コイルに定格電流値の電流が流れ、定格静磁場B_rが発生している状態で、撮像空間の静磁場分布の不均一度を計測し、計測した静磁場分布に基づいて、撮像空間の近傍に配置された補正磁場発生部が発生すべき補正磁場の分布を演算により求め、超電導コイルの電流値を、定格電流値よりも小さい所定(0より大きい)の低電流値まで低減し、低電流値の電流が前記超電導コイルに流れ、低静磁場B_lowが発生している状態で、補正磁場発生部の補正磁場を演算により求めた補正磁場に設定するように操作者に報知し、これを繰り返し行い、静磁場不均一度を低減する。
