An oxide superconducting wire wherein an outer periphery of an oxide superconductor is covered with a plating layer (stabilizing layer). In addition, the oxide superconductor includes: an oxide superconducting laminate that is formed by a tape-shaped substrate, an interlayer, and an oxide superconducting layer, in which the interlayer and the oxide superconducting layer are laminated on a main surface of the substrate; and an undercoat stabilizing layer that is laminated on an outer periphery of the oxide superconducting laminate. The undercoat stabilizing layer includes: a first undercoat stabilizing layer formed of Ag or an Ag alloy; and a second undercoat stabilizing layer formed of one of Cu, Ni, Pb, Bi, and an alloy containing Cu, Ni, Pb or Bi as a major component.