Wire drawing method and superconducting wire

A superconducting wire comprising:

• a core;
• a plurality of peripheral wires surrounding the core;
• and
• an outer shell disposed outside the peripheral wires, wherein
• each of the peripheral wires includes a porous material and a peripheral-wire cover covering the porous material,
• a shape of a cross section perpendicular to a longitudinal direction of the peripheral wire is a substantially annular sector including a first side in contact with the outer shell, a second side in contact with the core, and a third side and a fourth side that are in contact with the adjacent peripheral wires,
• a first average pore diameter of the porous material at a midpoint of the first side is larger than either one of a second average pore diameter of the porous material at a first point that is an intersection of the first side and the third side and a third average pore diameter of the porous material at a second point that is an intersection of the first side and the fourth side, and
• a fourth average pore diameter of the porous material at a midpoint of the second side is smaller than either one of a fifth average pore diameter of the porous material at a third point that is an intersection of the second side and the third side and a sixth average pore diameter of the porous material at a fourth point that is an intersection of the second side and the fourth side.