This magnetic resonance imaging device comprises: a static magnetic field generating unit which applies a static magnetic field to an imaging space a high frequency magnetic field generating unit which is disposed more to the imaging space side than the static magnetic field generating unit a bore wall which is disposed between the high frequency magnetic field generating unit and imaging space, and which forms a space in which a subject is placed and a temperature determination unit which determines whether the temperature of the bore wall exceeds a predetermined temperature. The temperature determination unit includes a thermistor, and a detection circuit which is connected to the thermistor and acquires a voltage signal corresponding to electrical resistivity of the thermistor to make a determination on the voltage signal. The detection circuit comprises a determination circuit which has hysteresis properties, wherein the determination circuit determines an abnormal condition exceeding the predetermined temperature when the temperature of the bore wall rises and the voltage signal reaches a voltage value of a higher temperature than the voltage value corresponding to a first temperature, and determines a normal condition at or below the predetermined temperature when the temperature of the bore wall decreases thereafter and the voltage signal reaches a voltage value of a lower temperature than the voltage value corresponding to a second temperature which is lower than the first temperature.La présente invention concerne un dispositif dimagerie par résonance magnétique qui comprend : une unité de génération de champ magnétique statique qui applique un champ magnétique statique à un espace dimagerie une unité de génération de champ magnétique haute fréquence qui est disposé davantage du côté espace dimagerie que lunité de génération de champ magnétique une paroi dalésage qui est disposée entre lunité de génération de champ magnétique haute fréquence et lespace di
