To facilitate the centering of individual wire-guide nozzles, to enable to position precisely plural wire-guide nozzles within a short time and to contribute to the improvement of productivity.

This positioning jig is applied to a wire-guide nozzle unit 11 to which plural wire-guide nozzles 10 are temporarily attached and regulates the position of the wire-guide nozzles 10 before the final attachment. The positioning jig 1 which is to be removed from the wire-guide nozzle unit 11 after the final attachment is properly separated from a support plate 2 in the horizontal direction to the support plate 2, and is arranged in the up-and-down direction at a pitch interval P corresponding to the intermittent movement of a base holder 40. Plural positioning pins 5 which contact with the temporarily attached plural wire-guide nozzles 10 and regulate the position of the wire-guide nozzles 10 in the up-and-down direction, and knocking parts 6 which are arranged on the edge surface 3a of the support plate 2 and regulate the position of the wire-guide nozzles 10 in the horizontal direction by knocking against individual end faces temporarily attached plural wire-guide nozzles 10 are also provided.