An electric heating device, for a motor vehicle, the electric heating device including an electrical connection box and a heating body. The heating body includes a plurality of heating elements intended to be supplied with current; a plurality of metal tubes, at least some of which include the heating elements; and a plurality of metal heat sinks. The metal tubes and the metal heat sinks form a conductive casing with the same electrical potential. At least one tube of the plurality of tubes includes a conductive element projecting from the at least one tube and in contact with the at least one tube. The projecting element is connected to a ground connector of the electrical connection box.

A PTC heater including: a PTC element heating part configured to generate heat; and a pair of heat dissipating plates disposed at two opposite sides of the PTC element heating part, respectively, so as to be in contact with the PTC element heating part and having a plurality of flow holes, in which the heat dissipating plates have heat dissipating fins each connected to one side of each of the flow holes and bent to a space between the heat dissipating plates.