The purpose of this invention is to provide a superconducting wire material substrate for manufacturing a superconducting wire material having exceptional superconductor characteristics, and a method for manufacturing the superconducting wire material substrate. In the superconducting wire material substrate, the metal crystal orientation of the outermost layer has a c-axis orientation of 99% or higher and a [delta][omega] of 6 degrees or less, and the ratio of the area in which the crystal orientation is offset from (001) [100] by 6 degrees or more is 6% or less per unit surface area.