A charging device for a motor vehicle, wherein the motor vehicle is provided with an electrical energy store, whereby electrical power for driving the motor vehicle is provided, a DC-DC converter, and a first, hard-wired interface to a first, external alternating voltage network, which is configured mechanically and electrically as a plug-and-socket connection between a first plug and a first socket, for charging the electrical energy store via a first rectifier, wherein the charging device has a second, inductive interface, with a receiving coil and an exciting coil, to a second, external alternating voltage network for charging the electrical energy store of the motor vehicle via a second rectifier, characterised in that - the output power of the DC-DC converter is used as charging power of the electrical energy store of the motor vehicle and the input of the DC-DC converter can be fed with electrical power via the first and the second interface (4, 6), - in that the charging device has a third, hard-wired interface, which is configured mechanically and electrically as a plug-and-socket connection between a second plug and a second socket, to an external direct voltage source for charging the electrical energy store of the motor vehicle, - in that the input of the DC-DC converter additionally can be fed with electrical power via the third interface, and - in that the DC-DC converter is designed in such a way that the lower limit of the nominal range of the input power of the DC-DC converter corresponds at least to the power which constitutes the lowest power from the set of the three maximum output powers of the three interfaces (4, 6, 8), and - in that the DC-DC converter is designed in such a way that the upper limit of the nominal range of the input power of the DC-DC converter at most corresponds to the sum of the maximum output powers of the three interfaces (4, 6, 8), whereby AC charging, induction charging and DC charging can be applied both separately and combined in one charging process, in which all combinations of AC charging, induction charging and DC charging can be applied. - the output power of the DC-DC converter is used as charging power of the electrical energy store of the motor vehicle and the input of the DC-DC converter can be fed with electrical power via the first and the second interface (4, 6), - in that the charging device has a third, hard-wired interface, which is configured mechanically and electrically as a plug-and-socket connection between a second plug and a second socket, to an external direct voltage source for charging the electrical energy store of the motor vehicle, - in that the input of the DC-DC converter additionally can be fed with electrical power via the third interface, and - in that the DC-DC converter is designed in such a way that the lower limit of the nominal range of the input power of the DC-DC converter corresponds at least to the power which constitutes the lowest power from the set of the three maximum output powers of the three interfaces (4, 6, 8), and - in that the DC-DC converter is designed in such a way that the upper limit of the nominal range of the input power of the DC-DC converter at most corresponds to the sum of the maximum output powers of the three interfaces (4, 6, 8), whereby AC charging, induction charging and DC charging can be applied both separately and combined in one charging process, in which all combinations of AC charging, induction charging and DC charging can be applied.