To provide a compact and high-performance MRI device.SOLUTION: An MRI device comprises a magnet device, a high-frequency coil, and a gradient magnetic field coil. When a direction of a static magnetic field is defined as a Z-direction, a direction orthogonal to the Z-direction is defined as an X-direction, and a direction orthogonal to the Z-direction and the X-direction is defined as a Y-direction, the gradient magnetic field coil comprises an X-direction gradient magnetic field main coil having different thicknesses in a first region 201 close to an imaging space and a second region 202 far from the imaging space, and a Y-direction gradient magnetic field main coil having different thicknesses in the first region and the second region.SELECTED DRAWING: Figure 2A【課題】小型且つ高性能なＭＲＩ装置を提供する。【解決手段】ＭＲＩ装置は、磁石装置と、高周波コイルと、傾斜磁場コイルとを備え、静磁場の方向をＺ方向、Ｚ方向に直交する方向をＸ方向、Ｚ方向及びＸ方向に直交する方向をＹ方向とする場合、傾斜磁場コイルは、撮像空間に近い第１領域２０１と撮像空間から遠い第２領域２０２とで厚さが異なるＸ方向傾斜磁場メインコイルと、第１領域と前記第２領域とで厚さが異なるＹ方向傾斜磁場メインコイルと、を備える。【選択図】図２Ａ
