Patent ID: 8901457

Claim:
A heat-transfer-medium heating apparatus comprising: a plate-shaped PTC heater; a first heat-transfer-medium circulating box in which a heat-transfer-medium circulating path is formed therein in close contact with a first surface of the PTC heater; a second heat-transfer-medium circulating box in which the heat-transfer-medium circulating path is formed therein in close contact with a second surface of the PTC heater and that is attached to the first heat-transfer-medium circulating box in a fluid-tight manner; an electrical-component cooling wall member that is provided in at least one of the first and the second heat-transfer-medium circulating boxes so as to be located adjacent to the heat-transfer-medium circulating path; an electrical component that controls the PTC heater is secured to the electrical-component cooling wall member; and a protruding portion positioned behind an installation position of the electrical component and extending towards the heat-transfer-medium circulating path, wherein the heat-transfer-medium heating apparatus is configured to heat a heat transfer medium flowing through the heat-transfer-medium circulating path with heat radiated from both surfaces of the PTC heater and to exchange heat between the heat transfer medium and the electrical component, said protruding portion is formed in a hemispherical shape on a surface of the electrical-component cooling wall member facing the heat-transfer-medium circulating path side, and only behind the installation position of the electrical component.