An imaging pulse sequence includes; a tagging sequence for modulating nuclear magnetization of an object to be imaged; and an imaging sequence for non-measurement of a part of k-space data.Control means includes: measurement-requiring region specification means which specifies a measurement region (measurement-requiring region) of the k-space required for reflecting the affect of the modulated nuclear magnetization on the image to be reconstructed; and sequence modification means for modifying the imaging sequence so as to measure the measurement region specified by the measurement requiring region specification means when executing the imaging sequence.