In a superconducting wire, a superconducting material joining layer joins a first end portion of a first superconducting material layer of a first wire and a second end portion of a second superconducting material layer of a second wire. The first wire and the second wire are disposed such that a first end face and a second end face are positioned to face in the same direction. The first wire further includes a first conductor layer disposed on the first main surface so as to be located adjacent to the first end portion. The second wire further includes a second conductor layer disposed on the second main surface so as to be located adjacent to the second end portion. The first conductor layer and the second conductor layer are connected to each other.