In order to provide an open-type MRI apparatus capable of effectively reducing quenching, a pair of superconducting magnets arranged opposite to each other with an imaging space in which a static magnetic field is to be formed therebetween, and a gradient magnetic field generator, Each of the pair of superconducting magnets is provided with a main coil, a shield coil for suppressing the leakage magnetic field of the main coil, and a coil bobbin, and Z-axis in the direction of opposing arrangement When the main coil is defined, the main coil has an annular shape having a Z axis at the center thereof, is opposed to the imaging space to hold the main coil, and is further disposed along the imaging space side of the main coil. A support plate for supporting the coil, an inner peripheral support member for fixing the Z-axis side of the support plate to the coil bobbin, and an outer peripheral side for fixing the outer peripheral side of the support plate opposite to the Z-axis of the support plate to the coil bobbin And a support member. It was placed primary coil between the plate and the coil bobbin, MRI apparatus, characterized in that.クエンチを効果的に低減することのできる開放型MRI装置を提供するために、静磁場を形成すべき撮像空間を間に挟んで互いに対向配置された一対の超伝導磁石と、傾斜磁場発生装置と、RFパルス照射コイルと、を有し、一対の超伝導磁石はそれぞれ、主コイルと、主コイルの漏えい磁場を抑制するためのシールドコイルと、コイルボビンと、を備え、対向配置の方向にZ軸を定義した場合に、主コイルはその中央にZ軸を有する環状の形状を成し、主コイルを保持するために撮像空間に対向し、さらに主コイルの撮像空間側に沿うように配置され主コイルを支持する支持板と、支持板のZ軸側をコイルボビンに固定する内周側支持部材と、支持板のZ軸とは反対側である支持板の外周側を前記コイルボビンに固定する外周側支持部材と、を備え、支持板とコイルボビンとの間に主コイルを配置した、ことを特徴とするMRI装置。
