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PROBLEM TO BE SOLVED : To provide an oxide superconductor that has an artificial pin introduced into it for improved magnetic field properties.SOLUTION : An oxide superconductor includes an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu). The rare earth elements include a first element which is praseodymium, at least one kind of second element selected from a group consisting of neodymium, samarium, europium, and gadolinium, at least one kind of third element selected from a group consisting of yttrium, terbium, dysprosium, and holmium, and at least one kind of fourth element selected from a group consisting of erbium, thulium, ytterbium, and lutetium. When the number of atoms of the first element is N(PA), the number of atoms of the second element is N(SA), and the number of atoms of the fourth element is N(CA), 1.5×(N(PA)+N(SA))≤N(CA) or 2×(N(CA)-N(PA))≤N(SA) is satisfied.SELECTED DRAWING : Figure 1