Abstract: A clip of T-shape molded from a polymer material has a holder portion for securely holding an associated wiring harness longitudinal and a retainer portion for securing the clip in position within its mounting room specified in an automobile. Both of the two portions are integral with each other through a bridging or middle portion. The bridging portion is formed with vertical recesses on its both sides, tapered in profile, formed hollow, or otherwise formed in a manner to reduce its mass. The harness-clip assembly, when fitting into its mounting room through a hole on the enclosure panel, can conveniently be bent resiliently with a resultant reduction in the overall transverse dimension of the assembly. This assures very easy procedure of wiring harness mounting without the necessity of otherwise providing a large-diameter hole on the panel, attaining economy in respect of cost and man-hour required in the fabrication of necessary parts or actual mounting procedure.