PROBLEM TO BE SOLVED: To provide a superconductive electromagnet device which achieves excellent cooling performance and good usability, a cooling method of the superconductive electromagnet device, and a magnetic resonance imaging apparatus.SOLUTION: A superconductive electromagnet device is formed so as to include: a coolant circulation passage 6 where a coolant R is circulated; a refrigerator 12 cooling vapor of the coolant R in the coolant circulation passage 6; a superconductive coil 4 cooled by the circulating coolant R; a protection resistor 10 which is placed in thermal contact with the superconductive coil 4 and has an internal space S; a high-boiling coolant supply part 22 supplying a high-boiling coolant, which has higher boiling point than the coolant R and is frozen by the coolant R, to the internal space S of the protection resistor 10; a vacuum insulation container 2 which houses at least the coolant circulation passage, the superconductive coil 4, and the protection resistor 10.【課題】冷却性能に優れて使い勝手の良い、超電導電磁石装置、その冷却方法、および磁気共鳴イメージング装置を提供する。【解決手段】冷媒Rが循環される冷媒循環流路6と、前記冷媒循環流路6における冷媒Rの蒸気を冷却する冷凍機12と、前記循環される冷媒Rにより冷却される超電導コイル4と、前記超電導コイル4と熱的に接触されると共に、内部空間Sを有する保護抵抗10と、前記保護抵抗10内の内部空間Sに、前記冷媒Rよりも高沸点、かつ、前記冷媒Rにより凍結される高沸点冷媒を供給する高沸点冷媒供給部22と、前記冷媒循環流路、前記超電導コイル4、および前記保護抵抗10を少なくとも収容する真空断熱容器2と、を備えるように、超電導磁石装置を構成した。【選択図】図1