A mobile terminal comprising: a main body having a front side, a lateral side, and a rear side; a rear cover configured to cover at least a portion of the rear side of the main body; a vehicle authenticating unit disposed on the rear cover; an auxiliary power supply unit configured to supply power to the vehicle authenticating unit and comprised by the rear cover; a power supply unit configured to supply power to the main body and the vehicle authenticating unit; a wireless charging unit comprised by the rear cover and configured to perform charging wirelessly; a near field communication unit comprised by the rear cover and configured to perform near field communication; and a control unit configured to cause the power supply unit to supply power to the vehicle authenticating unit; wherein the vehicle authenticating unit is configured to transmit authentication information to a vehicle to perform authentication after receiving power from the power supply unit, characterized in that: the control unit is configured to cause the auxiliary power supply unit to supply power to the vehicle authenticating unit when power of the power supply unit is less than or equal to a threshold amount, and cause the power supply unit to stop supplying power to the vehicle authenticating unit; the rear cover comprises coils or antennas constituting the vehicle authenticating unit, the wireless charging unit and the near field communication unit; wherein the coils or antennas are disposed to be coplanar and adjacent to each other. a main body having a front side, a lateral side, and a rear side; a rear cover configured to cover at least a portion of the rear side of the main body; a vehicle authenticating unit disposed on the rear cover; an auxiliary power supply unit configured to supply power to the vehicle authenticating unit and comprised by the rear cover; a power supply unit configured to supply power to the main body and the vehicle authenticating unit; a wireless charging unit comprised by the rear cover and configured to perform charging wirelessly; a near field communication unit comprised by the rear cover and configured to perform near field communication; and a control unit configured to cause the power supply unit to supply power to the vehicle authenticating unit; wherein the vehicle authenticating unit is configured to transmit authentication information to a vehicle to perform authentication after receiving power from the power supply unit, characterized in that: the control unit is configured to cause the auxiliary power supply unit to supply power to the vehicle authenticating unit when power of the power supply unit is less than or equal to a threshold amount, and cause the power supply unit to stop supplying power to the vehicle authenticating unit; the rear cover comprises coils or antennas constituting the vehicle authenticating unit, the wireless charging unit and the near field communication unit; wherein the coils or antennas are disposed to be coplanar and adjacent to each other. the control unit is configured to cause the auxiliary power supply unit to supply power to the vehicle authenticating unit when power of the power supply unit is less than or equal to a threshold amount, and cause the power supply unit to stop supplying power to the vehicle authenticating unit; the rear cover comprises coils or antennas constituting the vehicle authenticating unit, the wireless charging unit and the near field communication unit; wherein the coils or antennas are disposed to be coplanar and adjacent to each other.