To prvodie a wiring member for high-frequency current, which allows the high-frequency current to flow at low loss.

The wiring member for high-frequency current (60) includes a first connection part (61) to be connected to an output circuit, a second connection part (62) to be connected to an input circuit, and a relay port (64) to relay between the first connection part and the second connection part. At least the relay part is obtained, by laminating a plurality of metal thin plates (601) with insulating plates (602) for insulating the mutually adjacent metal thin plates.