1. A magnetic resonance imaging system provided with a multiple RF coil composed of a plurality of element coils and configured to use the multiple RF coil to perform parallel imaging with an object to be imaged, the system comprising: an imaging FOV specifying unit specifying a desired imaging FOV (Field Of View); an acquisition FOV specifying unit specifying an acquisition FOV on a basis of the imaging FOV, the acquisition FOV being used in performing a scan for the parallel imaging; an unfolding FOV specifying unit specifying an unfolding FOV larger in a size than the imaging FOV; an image acquisition unit configured to perform the scan with the object on a basis of the acquisition FOV so that a reconstructed image having the acquisition FOV is acquired every element coil in response to the scan; an unfolding processing unit configured to apply, on a basis of the unfolding FOV, unfolding processing to the acquisition-FOV reconstructed image acquired by the image acquisition unit so that the acquisition-FOV reconstructed image is unfolded to provide an image having the unfolding FOV; and an image producing unit producing an image having the imaging FOV from the unfolding-FOV image obtained by the unfolding processing unit.