Abstract: A soldering tool having a handle, a heating element, and a feeder mechanism for feeding wire or strip soldering metal through a passage in the handle arranged as a unit in an attachment piece let into the handle and comprises a manually operated member which can be depressed towards the handle, and a slide which is displaceable in one direction against spring bias by depression of the manuallY operated member. The slide has a driving dog for displacement of the soldering metal together with the slide in said one direction to advance the soldering metal towards the tip of the heating element through a guide tube which is arranged on a bracket supported by the handle, to be adjustable in relation to the heating element. A latch member is arranged to prevent backward movement of the soldering metal at the return of the slide under the spring bias in the other direction.