The present invention relates to an oxide superconducting wire. The wire has a filament made essentially of an oxide superconductor, and a stabilizing metal covering the oxide superconductor. The stabilizing metal includes a silver alloy having at least either higher mechanical strength or higher specific electrical resistance than that of silver. In one embodiment, the stabilizing metal further includes a first portion directly covering the oxide superconductor and a second portion covering the first portion. The first portion is adapted to prevent the component of the second portion from diffusing into and reacting with the oxide superconductor. The first and second portions have different materials, and the first portion is made essentially of an Ag—Sb alloy. In another embodiment, the stabilizing metal further has a first portion directly covering the oxide superconductor, a second portion covering the first portion and a third portion covering the second portion. The first portion is made essentially of silver or Ag—Sb alloy. The second portion is made essentially of silver or Ag—Sb alloy. The third portion has a different material with respect to the second portion.