PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging apparatus which reduces an error magnetic field caused by eddy current and reduces heat generation by a superconducting coil.SOLUTION: The magnetic resonance imaging apparatus comprises: a pair of magnetic poles facing each other across an imaging area； annular magnetic pole projection parts provided at the magnetic poles； annular static magnetic field generating means provided at the outer peripheries of the magnetic pole projection parts； and gradient magnetic field generating sources for generating gradient magnetic fields provided at the inner peripheries of the magnetic pole projection parts. The magnetic pole projection parts are provided with resistance areas so that an inner periphery side impedance becomes higher than an outer periphery side impedance.SELECTED DRAWING: Figure 2【課題】渦電流による誤差磁場が小さく、かつ超電導コイルの発熱が小さい磁気共鳴イメージング装置を提供する。【解決手段】撮像領域を間にして対向する一対の磁極と、前記磁極に設けられた環状の磁極突起部と、前記磁極突起部の外周に設けられた環状の静磁場発生手段と、前記磁極突起部の内周に設けられた傾斜磁場発生用の傾斜磁場発生源とを有し、前記磁極突起部は内周側インピーダンスが外周側インピーダンスより高くなるように抵抗領域が設けられることを特徴とする磁気共鳴イメージング装置。【選択図】図２
