PURPOSE: To manufacture a compound wire rod with a thick coating by a samll-sized device including small-thick size without spoiling the linearity of a core material by coating the core material with an alloy covering material which has a lower fusion point than it by extrusion in a half-fused state.

CONSTITUTION: Alloy 7 as a covering material is put in the container 1 of an extruder and heated by a heater 3 into a half-fused, i.e. solid-liquid mixed state, and is made to uniform by a stirring device 9 when necessary. On the other hand, while the core material is inserted from a hollow mandrel 5, pressure is applied to a ram 2 and the compound wire rod 8 is extruded from an extruding die 4. Tensile force is applied from in front of the core material 6 during the extrusion to increase the speed of the extrusion. Said alloy 7 has such composition that eutectic reaction is caused at temperature lower than the fusion point of Al by adding ≥1 kind of elements among Si, Sn, Mg, Zn, Cu, Ga, and Ge to Al, and fine solid-liquid mixture is obtained preferably. The core material 6 uses a material such as iron having a higher fusion point than the alloy 7.