Patent ID: 8895863

Claim:
A multilayer printed circuit board comprising: an insulating substrate made of an insulating base material and having a first surface and a second surface opposite to each other; a plurality of circuit layers arranged in the insulating substrate in a thickness direction of the insulating substrate; an electronic component including a terminal; an electrode disposed on one of the circuit layers exposed from the first surface of the insulating substrate, the electrode including a soldered portion at which the terminal of the electronic component is soldered; an internal layer conductor disposed on one of the circuit layers located inside the insulating substrate, the internal layer conductor having an electric potential different from an electric potential of the electrode, the internal layer conductor overlapping a part of the electrode, the internal layer conductor defining a plurality of through holes in a radial manner centering on the soldered portion in a plane perpendicular to the thickness direction; a heat releasing conductor disposed on one of the circuit layers next to the circuit layer on which the internal layer conductor is disposed, the circuit layer on which the heat releasing conductor is disposed being different from the circuit layer on which the electrode is disposed, the heat releasing conductor overlapping a part of the internal layer conductor; and a plurality of connection vias inserted in the through holes through the insulating base material, and coupling the electrode and the heat releasing conductor so as to enable a heat transfer between the electrode and the heat releasing conductor, wherein the internal layer conductor and the heat releasing conductor overlap a whole area of the soldered portion of the electrode.