A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires plural pieces of magnetic resonance data for generating plural species of image data of which contrasts are mutually different from a same object with mutually different data amounts by setting parameters for controlling the contrasts to mutually different values. The image data generating unit generates the plural species of the image data by image reconstruction processing and composition processing of the plural pieces of the magnetic resonance data or plural pieces of data derived from the plural pieces of the magnetic resonance data.