In addition, when a coaxial cable with a tape member being cylindrically wrapped around while adhering tightly to an entire periphery of an insulator as shown in Japanese Patent No. 3671729 is used as the high frequency signal transmission cable to be used in the fixed part cable designed to carry out a long-distance transmission, there arises a restriction on routing shape or place during long-distance cabling from the robot to the control device. For example, when such a coaxial cable is bent and routed, there is a possibility of the high frequency signal transmission properties deteriorating due to the insulator adhering tightly to and being compressed by its inner conductor or the tape member that is difficult to bend. In addition, a breaking, a wrinkling and a cracking in the tape member may occur by bending, which may lead to a deterioration in the high frequency signal transmission properties. For that reason, the high frequency signal transmission cable that satisfies both the good high frequency signal transmission properties (attenuation properties) and the pliability (flexibility) in the long-distance transmission is desired.

Accordingly, it is an object of the present invention to provide a high frequency signal transmission cable that is resistant to the occurrence of a high frequency signal attenuation during long-distance transmission, and resistant to the occurrence of a deterioration in high frequency signal transmission properties even when bent and routed during long-distance cabling.

For the purpose of solving the above problems, the present invention provides a high frequency signal transmission cable, comprising:

• • a conductor;