In order to further improve the accuracy of SAR estimation by accurately estimating, for each object, the energy of RF pulses absorbed into a part of an object, for example, a head, on the basis of measurement performed before main imaging, a nuclear magnetic resonance imaging apparatus estimates a head SAR by calculating a signal Sh generated from the head and a signal Sb generated from the whole object, calculating the ratio α between the signal generated from the head and the signal generated from the whole object, and calculating the energy Eh absorbed into the head using the ratio of the signals.
