In the high frequency signal transmission cable 1 according to the present embodiment, the inner conductor 2 is made of a compressed stranded wire conductor composed of a plurality of wires 2a stranded together, and subjected to a compression in such a manner that a cross-sectional shape perpendicular to the longitudinal direction of the cable 1 becomes a predetermined shape. In the present embodiment, the inner conductor 2 having a circular cross section as shown in FIG. 1 is formed by compressing the stranded wire conductor formed by concentrically stranding seven wires 2a together through a die having a circular outlet having a smaller diameter than that of the stranded wire conductor. One of the seven wires 2a to be arranged at the center of the cable 1 has a substantially hexagonal shape in a sectional view, and each of the other six wires 2a to be arranged on the periphery thereof has a substantially fan shape in the sectional view. Further, adjacent wires 2a of the plurality of wires 2a may be in contact (surface contact) with each other in such a manner that no space forms therebetween. Furthermore, the outer surface of the compressed stranded wire conductor may be the smooth surface in the circumferential direction of the cable 1 and the longitudinal direction of the cable 1. Note that, although, in the high frequency signal transmission cable 1 according to the present embodiment shown in FIG. 1, there is shown the example where the inner conductor 2 is composed of the compressed stranded wire conductor having a circular cross-sectional shape, the inner conductor 2 may be composed of the compressed stranded wire conductor subjected to a compression into a cross-sectional shape (e.g., a polygonal shape such as a square shape or the like) other than a circular shape. Since the inner conductor 2 is composed of the compressed stranded wire conductor having a circular cross-sectional shape, the high frequency signal transmission cable 1 can easily be bent in any direction, and therefore, is easily bent and routed.