A gradient coil device has a major axis gradient coil (x main coil, 9x) and a minor axis gradient coil (y main coil, 9y). A cross section of the major axis gradient coil which is perpendicular to a center axis z direction has an ellipse shape, and the major axis gradient coil generates a gradient magnetic field in which a magnetic field strength is inclined in the major axis direction (x direction). A cross section of the minor axis gradient coil which is perpendicular to the center axis z direction has an ellipse shape, and the minor axis gradient coil generates a gradient magnetic field in which a magnetic field strength is inclined in the minor axis direction (y direction). A length Lmy of the minor axis gradient coil (9y) in the center axis direction is shorter than a length Lmx of the major axis gradient coil (9x) in the center axis direction. Magnetic energy of the minor axis gradient coil (9y) is equal to or less than magnetic energy of the major axis gradient coil (9x). The maximum value of a leak field by the minor axis gradient coil (9y) is equal to or less than the maximum value of the leak field by the major axis gradient coil (9x). As a result, the leak field of the minor axis gradient coil (9y) is reduced by extending a length of a shield coil (2b) in the z direction as little as possible.La présente invention concerne un dispositif de bobine de gradient qui comprend une bobine de gradient de grand axe (bobine principale x, 9x) et une bobine de gradient de petit axe (bobine principale y, 9y). Une section transversale de la bobine de gradient de grand axe qui est perpendiculaire à une direction daxe central z a une forme dellipse, et la bobine de gradient de grand axe génère un champ magnétique à gradient dans lequel une intensité de champ magnétique est inclinée dans la direction du grand axe (direction x). Une section transversale de la bobine de gradient de petit axe qui est perpendiculaire à la direction de laxe central z a une forme dellipse, et la
