A wire coloring apparatus including a roller is provided to prevent drag of a colorant, which is jetted on an electric wire and not dried yet, the guide roller is arranged at a downstream side of a coloring nozzle, which jets a colorant toward a highest point of an outer surface of the electric wire moving along a lengthwise direction thereof, in a moving direction of the electric wire. The guide roller is formed with a pair of tapered surfaces catching and supporting the electric wire and approaching to each other in accordance with nearing to a rotating axis. When a radius REW of the electric wire 3 is 1.2 mm, an angle θT formed by the pair of tapered surfaces is designed at least 60 degrees and not more than θX degrees.
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