A connector identifying method for determining whether a connector that is fitted to a connecting portion to which a charging connector that connects a vehicle with an external feeding device is fitted when an electric storage device installed on the vehicle is charged with electric power from the feeding device is a feeding connector to be fitted to the connecting portion when electric power is fed from the vehicle to an external power receiving device or the charging connector, - the connector that is fitted to the connecting portion having a particular signal path that passively transmits a cable connection signal, wherein the condition of fit between the connector and the connection portion of the vehicle is detected by detecting means provided in the vehicle by detecting a change of impedance of the particular signal path, the connector identifying method including - detecting an impedance of the particular signal path that passively transmits information to a mechanism of a charging system by having the impedance of the signal path detected by the detecting means provided in the vehicle and that is provided in the connector fitted to the connecting portion when the connector is in a particular condition of fit with the connecting portion, wherein the mechanism of the charging system is at least one mechanism out of a power conversion mechanism for converting electric power supplied from the feeding device into a condition appropriate for charging of the storage device; and various mechanisms, such as a mechanism for determining a connecting condition of the charging connector, whether electric power can be supplied from the feeding device to the vehicle, and the rated current of the feeding device, the connector identifying method being characterized in that - the impedance of the particular signal path provided in the feeding connector falling within an impedance range for feeding which is set as a range of impedance that is different from an impedance range for charging which is set as a range of impedance of a signal path provided in the charging connector and corresponding to the particular signal path; the connector identifying method further includes: - determining that the connector fitted to the connecting portion is a charging connector when the detected impedance of the particular signal path falls within the impedance range for charging; and - determining that the connector fitted to the connecting portion is the feeding connector when the detected impedance of the particular signal path falls within the impedance range for feeding. - the connector that is fitted to the connecting portion having a particular signal path that passively transmits a cable connection signal, wherein the condition of fit between the connector and the connection portion of the vehicle is detected by detecting means provided in the vehicle by detecting a change of impedance of the particular signal path, the connector identifying method including - detecting an impedance of the particular signal path that passively transmits information to a mechanism of a charging system by having the impedance of the signal path detected by the detecting means provided in the vehicle and that is provided in the connector fitted to the connecting portion when the connector is in a particular condition of fit with the connecting portion, wherein the mechanism of the charging system is at least one mechanism out of a power conversion mechanism for converting electric power supplied from the feeding device into a condition appropriate for charging of the storage device; and various mechanisms, such as a mechanism for determining a connecting condition of the charging connector, whether electric power can be supplied from the feeding device to the vehicle, and the rated current of the feeding device, the connector identifying method being characterized in that - the impedance of the particular signal path provided in the feeding connector falling within an impedance range for feeding which is set as a range of impedance that is different from an impedance range for charging which is set as a range of impedance of a signal path provided in the charging connector and corresponding to the particular signal path; - determining that the connector fitted to the connecting portion is a charging connector when the detected impedance of the particular signal path falls within the impedance range for charging; and - determining that the connector fitted to the connecting portion is the feeding connector when the detected impedance of the particular signal path falls within the impedance range for feeding.