Disclosed is a manufacturing method of a sunroof cable unit. The sunroof cable unit serves to transmit power to a sunroof of an automobile. The sunroof cable unit includes a raw cable including a core extending by a long length in a given directional axis and a coil helically surrounding the core, the coil defining a groove between a pair of neighboring helices, an adhesive layer formed by applying an adhesive to the groove of the raw cable, and a plurality of piles adhered to the adhesive layer by electrostatic force generated within an electric field.