An oxide superconductor, comprising: an oxide superconducting layer including a first superconducting region containing barium, Ba, copper, Cu, and at least one first rare earth element selected from the group consisting of yttrium, Y, lanthanum, La, neodymium, Nd, samarium, Sm, europium, Eu, gadolinium, Gd, dysprosium, Dy, holmium, Ho, erbium, Er, thulium, Tm, ytterbium, Yb, and lutetium, Lu, the first superconducting region having a continuous perovskite structure, and the first superconducting region extending in a first direction, a second superconducting region containing barium, Ba, copper, Cu, and at least one second rare earth element selected from the group consisting of yttrium, Y, lanthanum, La, neodymium, Nd, samarium, Sm, europium, Eu, gadolinium, Gd, dysprosium, Dy, holmium, Ho, erbium, Er, thulium, Tm, ytterbium, Yb, and lutetium, Lu, the second superconducting region having a continuous perovskite structure, and the second superconducting region extending in the first direction, and a non-superconducting region disposed between the first superconducting region and the second superconducting region, the non-superconducting region being in contact with the first superconducting region and the second superconducting region, the non-superconducting region containing praseodymium, Pr, barium, Ba, copper, Cu, and at least one third rare earth element selected from the group consisting of yttrium, Y, lanthanum, La, neodymium, Nd, samarium, Sm, europium, Eu, gadolinium, Gd, dysprosium, Dy, holmium, Ho, erbium, Er, thulium, Tm, ytterbium, Yb, and lutetium, Lu, a ratio of the number of atoms of the praseodymium, Pr, to the sum of the number of atoms of the at least one third rare earth element and the number of atoms of the praseodymium, Pr, in the non-superconducting region being equal to or more than 20%, and the non-superconducting region extending in the first direction, characterized in that the non-superconducting region has a continuous perovskite structure that is continuous with the continuous perovskite structure of the first superconducting region and the continuous perovskite structure of the second superconducting region. an oxide superconducting layer including a first superconducting region containing barium, Ba, copper, Cu, and at least one first rare earth element selected from the group consisting of yttrium, Y, lanthanum, La, neodymium, Nd, samarium, Sm, europium, Eu, gadolinium, Gd, dysprosium, Dy, holmium, Ho, erbium, Er, thulium, Tm, ytterbium, Yb, and lutetium, Lu, the first superconducting region having a continuous perovskite structure, and the first superconducting region extending in a first direction, a second superconducting region containing barium, Ba, copper, Cu, and at least one second rare earth element selected from the group consisting of yttrium, Y, lanthanum, La, neodymium, Nd, samarium, Sm, europium, Eu, gadolinium, Gd, dysprosium, Dy, holmium, Ho, erbium, Er, thulium, Tm, ytterbium, Yb, and lutetium, Lu, the second superconducting region having a continuous perovskite structure, and the second superconducting region extending in the first direction, and a non-superconducting region disposed between the first superconducting region and the second superconducting region, the non-superconducting region being in contact with the first superconducting region and the second superconducting region, the non-superconducting region containing praseodymium, Pr, barium, Ba, copper, Cu, and at least one third rare earth element selected from the group consisting of yttrium, Y, lanthanum, La, neodymium, Nd, samarium, Sm, europium, Eu, gadolinium, Gd, dysprosium, Dy, holmium, Ho, erbium, Er, thulium, Tm, ytterbium, Yb, and lutetium, Lu, a ratio of the number of atoms of the praseodymium, Pr, to the sum of the number of atoms of the at least one third rare earth element and the number of atoms of the praseodymium, Pr, in the non-superconducting region being equal to or more than 20%, and the non-superconducting region extending in the first direction, characterized in that the non-superconducting region has a continuous perovskite structure that is continuous with the continuous perovskite structure of the first superconducting region and the continuous perovskite structure of the second superconducting region.