The magnetic resonance imaging device of invention, is installed inside the vacuum container and the aforementioned vacuum container where inside makes the vacuum is installed inside the liquid refrigerant container and the aforementioned liquid refrigerant container where the liquid refrigerant is accommodated inside is put in super-conductivity state containing by being damaged in the aforementioned liquid refrigerant, is connected by the insertion opening which is provided in the super-conductivity component and the aforementioned liquid refrigerant container where electric current is let flow, in the magnetic resonance imaging device which has the frozen expedient in order re-to condense the vapor where the aforementioned liquid refrigerant evaporates inside the aforementioned liquid refrigerant container, pressure inside the aforementioned liquid refrigerant containerRising, it features that the air influx prevention expedient which prevents the fact that the air flows to the aforementioned insertion opening of the aforementioned liquid refrigerant container is had from outside the aforementioned vacuum container.発明の磁気共鳴イメージング装置は、内部が真空にされた真空容器と、前記真空容器の内部に設置され、内部に液体冷媒が収容された液体冷媒容器と、前記液体冷媒容器の内部に設置され、前記液体冷媒に含侵されることにより超電導状態にされ、電流が流される超電導部材と、前記液体冷媒容器に設けられた挿入口に接続され、前記液体冷媒容器内で前記液体冷媒が気化した気体を再凝縮するための冷凍手段を備えた磁気共鳴イメージング装置において、前記液体冷媒容器内の圧力を上昇させて、前記真空容器の外部より前記液体冷媒容器の前記挿入口へ空気が流入することを防止する空気流入防止手段を備えたことを特徴としている。
