the specification is defined such that the direction of the current (i2a) flowing through the first circuit pattern and the direction of the current (i2b) flowing through the second circuit pattern coincide with each other.

According to the laminated circuit board device configured as described above, even when a dedicated ground layer for noise shielding is not provided, it is possible to suppress the influence of the induction magnetic field generated with the current change of the power line in each circuit pattern of the first layer and the third layer on the signal line of the adjacent second layer. That is, since the signal line of the second layer to be protected from noise exists between the first layer and the third layer, the signal line of the second layer is affected by both the power line of the first layer and the power line of the third layer. However, with respect to the second layer, the first layer and the third layer exist in opposite directions to each other in the upper-lower direction with respect to the thickness direction of the board, and the current flow directions are aligned, and the magnitude of the induction magnetic field generated according to the magnitude of the current change is also the same. Therefore, the magnetic field due to the influence of the power line of the first layer and the magnetic field due to the influence of the power line of the third layer cancel each other out.