An open-type magnetic resonance imaging device provides uniformity of a magnetic field without the necessity of lowering the degree of openness, and without increasing the superconducting wire material. The device includes at least one pair of main coils at least one pair of shield coils a pair of annular first magnetic substances disposed on an inner radial side of the main coils so that the first magnetic substances are plane symmetrical to each other and second magnetic substances as protrusion portions disposed on an outer circumferential side of an end surface of the first magnetic substances on an opposite side of the first magnetic substances.
