Superconducting electromagnet apparatus, the cooling method, and a magnetic resonance imaging apparatus

In such a way configured superconducting electromagnet apparatus comprising: a refrigerant (R) circulating a refrigerant circulation flow path (6); vapor refrigerant circulation flow passage (6) of the refrigerant (R) will be cooled protective resistor superconducting coil (4) in thermal contact, and having an internal space (S), (10);; refrigerating machine (12); cooling the superconducting coils (4) by circulating the refrigerant (R) to protect the resistance inner space (10) (S) supplying the refrigerant (R) as compared to high boiling point, and frozen by the refrigerant (R) high-boiling refrigerant of high boiling point refrigerant supply section (22); cooling at least a housing agent circulation flow path (6), the superconducting coil (4), and a protective resistor (10) is a vacuum insulating container (2).