A NbTi superconducting multicore wire includes:
a core portion;
a first barrier layer arranged around the circumference of the core portion and composed of a first copper alloy including at least one element selected from Ni or Mn;
a filament assembly arranged around the circumference of the first barrier layer and including a plurality of NbTi filament assemblies each including a plurality of NbTi filaments, the plurality of NbTi filaments being at least seven NbTi filaments, embedded in a matrix composed of a second copper alloy including at least one element selected from Ni or Mn;
a second barrier layer arranged around the circumference of the filament assembly and composed of the first copper alloy; and
a stabilizing layer arranged around the circumference of the second barrier layer and composed of a metal,
in a transverse cross section perpendicular to a longer direction, the plurality of NbTi filaments in each of the NbTi filament assemblies being arranged in one or more circular shapes each having a different diameter, centering on one NbTi filament; and a plurality of NbTi filaments arranged in a circular shape in an outermost circle being arranged at approximately equal intervals along a circumferential direction.