Maintaining the cooling ability of the Cryo cooler in the appropriate range, it offers the MRI device which stably can generate magnetostatic field. The super-conductivity coil (201 and 202) with, the super-conductivity coil and the customer vessel which accommodates with the refrigerant (203 and 204) with, the cooling section which liquefies the vapor where the refrigerant inside the container evaporates again (208) with, the pressure sensing station which detects the pressure inside the container (215) with, the cooling section and the heat generation section where the inside of the container becomes feverish at least with one side (216) with, the control section (127) with, the computer (114) it has the super-conductivity magnet (101) in the magnetic resonance imaging device which is used. The control section (127), the heat generation section (216) the calorific value is controlled the pressure sensing station (215) according to the pressure which is detected. The computer (114), it decides main point no of maintenance of the cooling section the heat generation section (216) making use of the calorific value.クライオクーラーの冷却能力を適切な範囲に維持して、安定的に静磁場を発生することができるMRI装置を提供する。超電導磁石(101)を用いた磁気共鳴イメージング装置において、超電導コイル(201、202)と、超電導コイルと冷媒とを収容する客器(203、204)と、容器内の冷媒が気化した気体を再び液化する冷却部(208)と、容器内の圧力を検出する圧力検出部(215)と、冷却部および容器内の少なくとも一方で発熱する発熱部(216)と、制御部(127)と、コンピュータ(114)を備える。制御部(127)は、圧力検出部(215)が検出した圧力に応じて、発熱部(216)の発熱量を制御する。コンピュータ(114)は、発熱部(216)の発熱量を用いて冷却部の保守の要否を判定する。
