The sheath 6 is made of an insulative resin composition such as a PVC (polyvinyl chloride), a urethane, a polyolefin or the like. Although the sheath 6 is formed by extrusion molding, if solid molding is performed, the resin constituting the sheath 6 enters the spaces between the wires of the metal shield layer 5, and the high frequency signal transmission cable 1 may become hard and difficult to bend. For the purpose of avoiding this, in the present embodiment, the sheath 6 is being molded by tube extrusion. This allows the resin constituting the sheath 6 to be suppressed from entering the spaces between the wires of the metal shield layer 5, and the sheath 6 and the metal shield layer 5 to be moved separately from each other. That is, in the present embodiment, the sheath 6 and the metal shield layer 5 are not adhered, so that the metal shield layer 5 can relatively freely be moved within the sheath 6. This makes the high frequency signal transmission cable 1 easier to bend.

(Plating Layer 4 and Crack Suppressing Layer 7)