To provide a heat medium heating device capable of increasing adhesion property of a cooling plate without increasing the size thereof, and a vehicle air conditioning apparatus provided with the same.

The heat medium heating device is provided with: electrode plates which are sequentially stacked on at least both surfaces of a PTC (Positive Temperature Coefficient) element with the PTC element put therebetween; a plurality of flat heat exchanger tubes 17 which each comprise an inlet header part 22 through which a heat medium is supplied, an outlet header part 23 through which the heat medium is led out, and adhesion members provided in the inlet header part 22 and the outlet header part 23, are stacked parallel to each other with the electrode plates interposed therebetween, and exchange heat with the electrode plates; a substrate which is provided on one surface side of the stacked plurality of heat exchanger tubes 17 and connected to the electrode plates; a heat generating element which is connected to the substrate; a plate-shaped pressing member 16 which is connected to the other surface side of the substrate and presses the stacked plurality of heat exchanger tubes 17; and a casing 11 which houses the electrode plates, the heat exchanger tubes 17, the substrate, the pressing member 16, and the heat generating element.