Furthermore, since the plating layer 4 is being formed on the crack suppressing layer 7 made of the resin, even when the high frequency signal transmission cable 1 is appropriately bent according to a routing layout, the crack suppressing layer 7 can be slid relative to the insulator 3 while being maintained in contact with the outer surface of the insulator 3 with no space therebetween, and therefore the distance between the inner conductor 2 and the plating layer 4 can be held substantially constant. For example, when a metal tape formed with a metal layer on one surface of a resin layer is cylindrically wrapped in place of the plating layer 4 and the crack suppressing layer 7, a wrinkling or a breaking may occur in the metal tape by bending, causing a gap formation between the insulator and the metal tape, or the like, and a local variation in the characteristic impedance, leading to an increase in the return loss due to the mismatching of the characteristic impedance. On the other hand, in the high frequency signal transmission cable 1 according to the present embodiment, since the crack suppressing layer 7 is flexibly deformed according to bending, the distance between the inner conductor 2 and the plating layer 4 is kept substantially constant, so the characteristic impedance can be kept substantially constant in the longitudinal direction of the high frequency signal transmission cable 1, and the return loss can be suppressed and the good attenuation properties can be achieved.