A shaft earthing ring for establishing an electrical potential connection between a rotating shaft and a housing of an electric motor comprises an electrically conductive earthing element which has a contact portion that contacts the shaft, and a metal support body fixed to the housing. The metal support body has at least one ventilation opening which allows ventilation of a housing interior while bypassing the earthing element.

There is provided a rotary connector including: a case; and a rotor, in which the rotor has a plurality of conductive ring portions, each of which includes a core wire ring, a first GND ring, a second GND ring, a first core wire barrier, and a second core wire barrier, and a plurality of channel barriers arranged respectively between the plurality of conductive ring portions, the case has a plurality of connector portions, each of which includes a connector, a core wire brush having one end side connected to the connector and another end side in contact with the core wire ring, a first GND brush having one end side connected to the connector and another end side in contact with the first GND ring, and a second GND brush having one end side connected to the connector and another end side in contact with the second GND ring.

There is provided a rotary connector including: a case; and a rotor, in which the rotor has a plurality of conductive ring portions, each of which includes a core wire ring, a first GND ring, a second GND ring, a first core wire barrier, and a second core wire barrier, and a plurality of channel barriers arranged respectively between the plurality of conductive ring portions, the case has a plurality of connector portions, each of which includes a connector, a core wire brush having one end side connected to the connector and another end side in contact with the core wire ring, a first GND brush having one end side connected to the connector and another end side in contact with the first GND ring, and a second GND brush having one end side connected to the connector and another end side in contact with the second GND ring.