<p>A coloring nozzle capable of securely injecting the droplets of a coloring material in a fixed amount each to a specified position on the outer surface of an article. The coloring nozzle (31) colors a wire (3) by injecting the droplets of the liquid coloring material in a fixed amount each to the outer surface (3a) of the wire (3) as the article. The coloring nozzle (31) comprises a nozzle (54) injecting the droplets of the coloring material, a nozzle cover (55), and a washing fluid supply source (62). The nozzle cover (55) covers at least the tip part (37b) of the nozzle (54). The tip face (50b) of the nozzle (54) and the end face (56a) of the nozzle cover (55) are positioned on the same plane. The washing fluid supply source (62) supplies a washing fluid to the inside of the nozzle cover (55). The coloring nozzle (31) injects the droplets of the coloring material from the nozzle (54) in the state of the washing fluid being kept in the nozzle cover (55) by surface tension.</p>
