1. A magnetic resonance imaging apparatus comprising: a memory; and a processor comprising processing circuitry, wherein the memory stores instructions, which when executed by the processor, cause the magnetic resonance imaging apparatus to perform operations comprising: a data collection unit that repetitively performs performing a tag mode of applying an RF wave to at least an upstream portion of an imaging area to label a fluid flown into the imaging area and, after a lapse of an inversion time from application of the RF wave, performing magnetic resonance data collection, while changing the inversion time; an image reconstruction unit that reconstructs reconstructing a plurality of tag images corresponding to a plurality of different inversion times based on magnetic resonance data collected in the tag mode; a reference image generation unit that generates generating a reference image based on the plurality of the tag images; and a fluid image generation unit that generates generating a subtraction image between each of the tag images and the reference image as a fluid image.