1. Magnetic resonance imaging method for imaging the object to be examined at high speed by using magnetic resonance phenomenon comprising the following steps for: (a) applying RF pulse, slice encode gradient magnetic field, phase encode gradient magnetic field, readout gradient magnetic field to the object to be examined placed in uniform static magnetic field in accordance with predetermined pulse sequence, and executing this pulse sequence repeatedly; (b) detecting NMR signal generated from the object to be examined by executing said step at each small type RF coil composing multiple coil, and memorizing their NMR signal into k space separately; (c) performing process of calculation of sensitivity distribution of each coil using data only of low spatial frequency region at each k space; (d) performing image composing procession using sensitivity distribution of coil calculated in said step (c) and measured data memorized in said k space.