PURPOSE: To process a magnetic resonance signal from a body to be checked with high accuracy by providing a reference oscillator generating a reference clock, a frequency divider for sampling, a computer sampling control data generator and a clock supplying device.

CONSTITUTION: When a reference oscillator 32 generates a reference clock C to determine the impression timing of a high frequency magnetic field pulse and a tilted magnetic field, a frequency divider 36 for sampling generates a clock signal CS for sampling based on this reference clock. A computer sampling control data generator 46 generates sampling control data DS based on this clock signal CS. A clock supplying device 26 controls the sampling timing of a computer 16 based on the sampling control data DS, which are generated by the generator 26. Thus, since sampling timing is exactly determined based on one reference clock to be used for each timing control, the peak of the magnetic resonance signal can be fetched with the high accuracy.