To provide a power line carrier communication device that suppresses the upsizing of a circuit and at the same time suppresses a common mode current, and can suppress spurious noise from a conductor line.
One end of a line L1 is connected to one end of secondary winding n12, and the other end is connected to a transmission signal processing section 7. One end of a line L2 is connected to the other end of the secondary winding n12, and the other end is connected to the transmission signal processing section 7. On the line L1, an impedance adjustment section 15 for adjusting the impedance of the line L1 is connected. The impedance adjustment section 15 has a switch SWa, n (a positive number) resistors Ra1-Ran, and an operation section 151. The resistors Ra1-Ran are connected in parallel. The switch SWa is composed of, for example, a multiplexer, and connects one of the resistors to the line L1 according to operation input received by the operation section 151.
Takao Ito
Jiro Higuchi