To reduce the height of a power source circuit part in a lower part of the conventional cabinet rack, and further the height of a cabinet rack, and prevent malfuction which is to be caused by power source noise and spurious radiation.

In the power source circuit in the lower part of a cabinet rack, a transformer or an inductor constituted by collecting a plurality of unit transformers or inductors whose height is uniform are used as a power source circuit of low height by using a transformer or an inductor in which a plurality of unit windings are installed on a closed magnetic path core. The noise filter function for a high frequency band in which a capacitor or a ferrite core is loaded is imparted to a bus-bar for power supply which stretches upward from the power source circuit in the lower part of a cabinet, and a radio wave absorbent is arranged between plug-in units, thereby constituting a cabinet rack.