Superconducting magnet device

A superconducting magnet device comprising:

• a superconducting coil;
• a radiation shield housing the superconducting coil;
• a refrigeration unit that cools the superconducting coil and the radiation shield;
• a vacuum case housing the radiation shield;
• an electrode member provided to the vacuum case;
• and
• a conductive member connecting the electrode member to the superconducting coil,
• wherein
• the vacuum case includes
• a case body housing the superconducting coil, and
• a surrounding cover that is connected to the case body and surrounds the refrigeration unit,
• the conductive member includes a contact portion having a sleeve-shaped outer circumferential face and thermally contactable with an inner face of the surrounding cover via an insulating material,
• the surrounding cover includes a heat radiating part including at least a surface of a portion of the surrounding cover overlapping the contact portion in a radial direction of the surrounding cover, and
• thermal conductivity of the heat radiating part is higher than thermal conductivity of stainless steel.