PROBLEM TO BE SOLVED: To provide an image processing apparatus and magnetic resonance imaging apparatus able to appropriately evaluate the dynamics of a fluid in a subject.SOLUTION: An image processing apparatus includes a specifying unit and a deriving unit. The specifying unit specifies a fluid region in a plurality of images that are acquired by applying a labeling pulse to a label region where the fluid flows and that are mutually related. The deriving unit derives an index indicating dynamics of the fluid on the basis of the specified fluid region.COPYRIGHT: (C)2014,JPO&INPIT