An overhead cable is provided that comprises a tension-bearing core of twisted steel strands, a conductive layer of aluminum strands arranged at the outer circumference of the twisted steel strands, and an outermost layer arranged at the outer circumference of the aluminum strands. The outermost layer is formed by twisting together a plurality of adjoining segment strands. A spiral groove is provided in the longitudinal direction along the boundary portion of the outer circumferential surface of each adjoining segment strand. Along the contour of a cross-section of this outermost layer, each groove comprises an arc-shaped curve having a radius R centered around a vertex of a regular polygon. Each part between adjoining grooves comprises an arc-shaped curve which is concave with respect to a straight line connecting adjoining of a regular polygon, intersecting the arc-shaped curve with radius R.