An oxide superconducting wire includes an oxide superconducting laminate, the oxide superconducting laminate including: an intermediate body having a tape-shaped substrate, an intermediate layer formed on a main surface of the substrate, and an oxide superconducting layer formed on the intermediate layer; and a protective layer formed on the intermediate body. An average film thickness T ave of the protective layer is 0.1 µm to 5 µm. The ratio T Ã /T ave between a standard deviation T Ã and the average film thickness T ave of a film thickness of the protective layer is 0.4 or less.