To provide both an apparatus for producing metallic filament yarn capable of carrying out the consistent quality control with a high productivity and a method for producing the metallic filament.

This apparatus for producing metallic filament yarn is obtained by installing a feeding means for continuously feeding a composite wiry material prepared by covering a metallic wiry material with an internal package isolating material and further covering the plural wiry materials with an external package isolating material, a wire drawing machine 4 capable of performing the wire drawing treatment of the continuously fed composite wiry material, a gear crimping machine 7 having gears for crimping the composite wiry material treated by the wire drawing and a dissolving tank 10, formed continuously to the gear crimping machine 7 and capable of subsequently immersing the crimped composite wiry material in a dissolving liquid and then dissolving and removing the internal and external package isolating materials.