Patent ID: 8022797

Claim:
A superconducting coil apparatus comprising: a cylindrical coil container which has an inner circumferential surface and an outer circumferential surface and two end surfaces; a superconducting coil comprising a superconducting member, the superconducting coil being stored in the coil container to be cooled so that the superconducting member is wound on the inner circumferential surface; and a columnar magnetic body which is fitted to the inner circumferential surface of the coil container and having two end surfaces, each end surface having a circumferential edge portion, wherein the circumferential edge portions of the two end surfaces of the columnar magnetic body are each provided with a flange, and each flange is brought into contact with an end surface of the coil container, and wherein each flange includes an inclined surface narrowed toward one end surface of the columnar magnetic body at a position where magnetic flux lines pass through the columnar magnetic body in an axial direction of the columnar magnetic body.