Gradient coil device and magnetic resonance imaging device

A gradient coil device comprising:

• a major axis gradient coil, having a cross section shape vertical to a center axis direction which is an ellipse, configured to generate a gradient magnetic field having a magnetic field intensity inclined in a major axis direction of the ellipse at a magnetic field space;
• a minor axis gradient coil, having a cross section shape vertical to the center axis direction which is an ellipse, configured to generate a gradient magnetic field having a magnetic field intensity inclined in a minor axis direction of the ellipse at the magnetic field space;
• a major axis shield coil, having a cross section shape vertical to the center axis direction which is circular, configured to suppress a residual magnetic field generated by the major axis gradient coil at a space outside the magnetic field space;
• and
• a minor axis shield coil , having a cross section shape vertical to the center axis direction which is circular, configured to suppress a residual magnetic field generated by the minor axis gradient coil at a space outside the magnetic field space,
• wherein the length (Lsy) of the minor axis shield coil in the center axis direction is longer than the length (Lsx) of the major axis shield coil in the center axis direction.