Wire solder is supplied to the soldering tip with high precision. Since a ruby nozzle enables thread solder supply with a small diameter with detailed-izing and precise-izing of a soldering work, by embedding the ruby chip which united the tip of a thread solder supply nozzle with the diameter of thread solder, gap of wire solder is obstructed to the minimum, a slide is good and it is possible to supply wire solder to a soldering tip future end more exactly.   *Various sizes from 0.3φ to 1.0 are available.