A connection structure for superconductor wires, in which two superconductor wires (10A, 10B) include respective oxide superconducting conductor layers, which are each formed on one side of a base material and are in contact with each other, wherein the side of the base material on which the oxide superconducting layer is formed is the film forming surface and the side of the base material opposite to the one on which the oxide superconducting layer is formed is the back surface, wherein the oxide superconducting conductor layers are conjoined with each other while facing each other at a connected end of each of the two superconductor wires (10A, 10B), wherein multiple through holes are provided at each of the connected ends of the superconductor wires (10A, 10B), wherein said through holes penetrate the base material and the oxide superconducting conductor layer; the position of the through holes of the first superconductor wire corresponds to the position of the through holes of the second superconductor wire, with the superconducting conductor layers facing each other, characterized in that, an embedment material having a higher shear stress than the oxide superconducting conductor layers is provided from one of the two superconductor wires to the other one of the two superconductor wires in a thickness direction of the two superconductor wires (10A, 10B) at the connected end of each of the two superconductor wires (10A, 10B), and wherein the embedment material fills, before hardening, the through holes which are provided at the end of the superconductor wires and penetrates at least one of the superconductor wires (10A, 10B) through the back surface opposite to the film forming surface of the superconductor conducting layer of the base material. wherein the side of the base material on which the oxide superconducting layer is formed is the film forming surface and the side of the base material opposite to the one on which the oxide superconducting layer is formed is the back surface, wherein the oxide superconducting conductor layers are conjoined with each other while facing each other at a connected end of each of the two superconductor wires (10A, 10B), wherein multiple through holes are provided at each of the connected ends of the superconductor wires (10A, 10B), wherein said through holes penetrate the base material and the oxide superconducting conductor layer; the position of the through holes of the first superconductor wire corresponds to the position of the through holes of the second superconductor wire, with the superconducting conductor layers facing each other, characterized in that, an embedment material having a higher shear stress than the oxide superconducting conductor layers is provided from one of the two superconductor wires to the other one of the two superconductor wires in a thickness direction of the two superconductor wires (10A, 10B) at the connected end of each of the two superconductor wires (10A, 10B), and wherein the embedment material fills, before hardening, the through holes which are provided at the end of the superconductor wires and penetrates at least one of the superconductor wires (10A, 10B) through the back surface opposite to the film forming surface of the superconductor conducting layer of the base material.