1. A magnetic resonance imaging apparatus, comprising: a measurement controller configured to control measurement of an echo signal from an imaging area containing blood streams, flowing different directions, of an examinee on the basis of (i) a pulse sequence containing a pre-saturation pulse for pre-saturating a pre-saturation area of an examinee and (ii) an actual imaging sequence for measuring an echo signal from the imaging area, wherein at least a part of the pre-saturation area is overlapped with the imaging area; and a calculation processor configured to re-construct a blood vessel image by using the echo signal, wherein the measurement controller controls a rate of overlapped area against the imaging area in accordance with the velocities of the pre-saturated blood streams so that one of the pre-saturated blood streams to be subjected to signal suppression in the blood vessel image fills a blood vessel thereof in the imaging area and the other of the pre-saturated blood streams to be imaged in the blood vessel image flows out from the imaging area at the time of the measurement of an echo signal by the actual imaging sequence.