To provide an NbTi-based superconducting wire material excellent in soundness while a filament diameter is ≤20 μm under a high copper ratio, and to provide its manufacturing method.
The NbTi-based superconducting wire material is buried with a large number of NbTi alloy filaments in a copper matrix. Its copper ratio (cross sectional area of copper matrix/total cross sectional area of all NbTi alloy filaments) is 10 to 30, the NbTi alloy filament diameter is 3 to 20 μm, all filaments are included inside in the cross section of a wire material, and a filament assembly part surrounded by a circumscribed circle having a minimum radius is concentrically arranged in the area of a reference circle with a diameter of 0.4 D (D: diameter of wire material) about the cross section center of the wire material. The filament assembly part preferably has the copper ratio to the extent of 0.9 to 1.3.
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