Soldering iron

A soldering iron comprising:

• an iron main body;
• and
• an iron tip having a leading end configured to fuse solder, the iron tip comprising:
• an iron tip main body having a hollow space inside extending along a longitudinal direction;
• an insulator tube accommodated in the hollow space;
• a heater wire configured to heat the iron tip main body, and
• a temperature sensor having a temperature detector and a sensor wire and configured to detect a temperature of the leading end side of the iron tip,
• wherein the heater wire includes:
• an outward route part extending towards the leading end of the iron tip,
• a return route part extending towards a base end of the iron tip and being wound like a coil around an outer circumferential surface of the insulator tube, and
• a folding back part arranged in the hollow space at a vicinity of the leading end of the iron tip and folded back between the outward route part and the return route part,
• wherein the insulator tube has a heater wire hole configured to accommodate the return route part of the heater wire and a sensor wire hole configured to accommodate the sensor wire, the heater wire hole and the sensor wire hole being independent of each other,
• the return route part of the heater wire is wound directly around the outer circumferential surface of the insulator tube having both the heater wire hole and the sensor wire hole,
• the wound return route part of the heater wire is arranged around the outward route part of the heater wire, and
• a wall of the insulator tube is disposed between the outward route part of the heater wire and the wound return route part of the heater wire.