Superconducting wire, superconducting coil using same, and MRI

A superconducting coil comprising:

• a superconducting wire which includes a plurality of MgB2 strands and a first base metal, wherein
• a center point of a region surrounded by the plurality of MgB2 strands and a central axis of a superconducting wire cross section are located apart from each other in a cross section orthogonal to a wire longitudinal direction,
• when a bending radius during a heat treatment of the superconducting wire is larger than a bending radius of the superconducting coil, the superconducting wire is bent in the superconducting coil so that the center point of the region surrounded by the plurality of MgB2 strands is located inside the bending, and
• when a bending radius during the heat treatment of the superconducting wire is smaller than the bending radius of the superconducting coil, the superconducting wire is bent in the superconducting coil so that the center point of the region surrounded by the plurality of MgB2 strands is located outside the bending.