Patent ID: 8288658

Claim:
A multilayer circuit board including a plurality of conductor layers and a plurality of resin insulation layers which are laminated alternately, comprising: a first wiring formed on a first layer of the plurality of conductor layers; a second wiring formed on a second layer of the plurality of conductor layers; a third wiring formed on a third layer of the plurality of conductor layers, wherein portions of the first wiring and the second wiring which face each other in a laminated direction in which the plurality of conductor layers are laminated extend in parallel; wherein the first wiring and the second wiring are arranged so as to weaken a magnetic field generated by a current which flows through the first wiring and a magnetic field generated by a current which flows through the second wiring to each other; wherein the first wiring and the second wiring are a power source wiring and a ground wiring in which currents flow therethrough in an opposite direction to each other; and wherein the first wiring, the second wiring, and the third wiring are respectively connected to phases of a multiphase motor provided outside.