In order to respond to positional changes of body motion, such as respiratory motion, in various directions and to prevent an increase in the imaging time due to acquisition of body motion information or the occurrence of dead time in the measurement, a control unit of an MRI apparatus acquires association information in which body motion information detected by an external monitor, such as a pressure sensor for monitoring the movement of an object to be examined, and body motion information measured from an NMR signal by the navigator sequence are associated with each other in advance. During imaging, body motion information from the navigator is estimated using body motion information detected by an external monitor mounted on the object to be examined and the association information acquired in advance, and control, such as performing gating imaging or correcting the imaging slice position based on the estimated body motion position, is performed.
