An electrical power transmission and signal exchange device is configured to maintain a high rate of electrical power transmission speed between an automotive vehicle body and steering wheel. The device primarily includes a rotating transmission that includes a rotating part and fixed part mutually assembled to define an internal space. Multiple electrical circuits are provided in the form of electrical power coils are connected to an airbag igniter without the inclusion of a multiplexing circuit, and signal exchange coils are connected to printed circuit boards that include multiplexing circuits.