Patent ID: 7796002

Claim:
A magnetic field generator for MRI, comprising: a pair of permanent magnet groups opposed to each other with a space in between, each group including a plurality of permanent magnets bonded to each other; a yoke for magnetically connecting the pair of permanent magnet groups; and a pair of pole pieces provided on respective main surfaces of the permanent magnet groups; the permanent magnet group having a projection extending more outward than an area of contact with the pole piece, a magnetic field being generated in a space between the pole pieces, characterized by a permanent-magnet fixing member for preventing separation of the permanent magnets from the permanent magnet group, the permanent-magnet fixing member being formed along an outer circumferential side surface of the projection of the permanent magnet group wherein the permanent-magnet fixing member is provided by a belt-shaped member attached to the outer circumferential side surface of the projection, and a reinforcing member is provided between the belt-shaped member and the projection.