Abstract: A high-frequency coupler used in communication of high frequency signals, which aims to provide a high-frequency coupler satisfying both constant communication quality and thinning. The high-frequency coupler includes a circuit board and a toroidal coil. The circuit board includes a first receiving passageway and a second receiving passageway. The toroidal coil extends through the first receiving passageway and the second receiving passageway between a first surface and a second surface of the circuit board. The toroidal coil orbits on both sides of the first surface and the second surface in a circular shape. The toroidal coil reverses an orbiting direction at a position substantially near a half of a length of the toroidal coil.