PURPOSE: To obtain the subject combined filament yarn having excellent electroconductivity, yarn properties, hue and dyeability by combining a core- sheath type electroconductive conjugate fiber comprising of sheath part of thermoplastic polymer and core part containing low-melting point metal specified its mixing ratio and shape in length direction and a non-electroconductive fiber.

CONSTITUTION: A non-electroconductive fiber is combined with a core-sheath type electroconductive conjugate fiber using metal having melting point lower than the thermoplastic polymer in sheath part as core part in which sectional ratio of the core in cross section of the fiber is 0.2-50% and degree of variability of cross-sectional area of core part in length direction in ≤25%, and the core part is substantially continued in length direction. Shrinkage in boiling water of the two fiber are respectively adjusted as ≤15%, difference of the shrinkage in boiling water is adjusted as 0-15% and mixed ratio of the core-sheath type electroconductive conjugate fiber is adjusted as 0.25-46wt.%.