A semi-finished wire (1) for a Nb3Sn superconducting wire (45) has a multiplicity of elements containing Nb packed against each other (6). The elements containing Nb (6) each have a rod containing Nb (7) and an enclosure containing Cu (8) surrounding the latter. The semi-finished wire also has a structure containing Sn (5) and a matrix containing Cu (4) in which the structure containing Sn (5) is disposed and on and/or in which the elements containing Nb (6) are disposed. The enclosures containing Cu (8) of the elements containing Nb (6), contain Sn. The semi-finished wire is suitable for manufacturing an Nb3Sn superconducting wire with which further improved superconducting current-carrying capacity is achieved.