A magnetic resonance imaging apparatus according to one embodiment includes an arranger, a sensitivity deriver, and an image generator. The arranger arranges time-series data at a part of sampling points out of sampling points of a k-space determined based on an imaging parameter. The sensitivity deriver derives a sensitivity distribution in a time-space, in which the time-series data transformed in a time direction is expressed with a coefficient value, based on the time-series data. The image generator generates an image of the time-series data using the time-series data and the sensitivity distribution.