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The present invention provides an oxide superconducting bulk magnet able to generate a strong magnetic field without fracturing at the time of magnetization in a 5 T or more high magnetic field even if a diameter 50 mm or more large size. The oxide superconducting bulk magnet is an oxide superconducting bulk magnet comprised of a REBa2Cu3O7-x phase in which RE2BaCuO5 phases are dispersed, structured having a center core part with a reinforcing material provided at its outer periphery part and having, centered at the center core part, one or more ring-shaped oxide superconducting bulk magnets with reinforcing materials provided at their outer periphery parts and arranged in a nested manner, where, RE : a rare earth element or combination of the same; x : amount of oxygen deficiency, 0
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