The purpose of the present invention is to obtain an image with a desired contrast while minimizing specific absorption rate and without deteriorating image quality in a variable refocus flip angle sequence. To this end, Teequiv specified by a signal decay pattern SSP obtained by a flip angle changing pattern FAP is compared with a designated Teequiv, and the flip angle changing pattern FAP is changed according to the comparison result to search for the flip angle changing pattern FAP which gives a desired contrast. Then, the flip angle changing pattern FAP which is capable of realizing the designated Teequiv is determined. Then, imaging is performed using each flip angle constitutes the determined flip angle changing pattern FAP.