PURPOSE: To widely ensure and form a component mounting area for the display/operation or the like of a printed wiring board unit mounted with high density.

CONSTITUTION: In an electronic.communication equipment wherein a plurality of printed wiring board units 16 are connected in parallel by plug-in insertion to connectors of the back board of a cabinet 15, a printed wiring board 23 is arranged so as to intersect the front of a plurality of the printed wiring board units 16. The board 23 is so fixed that one side is retained to be able to opened and shut toward the front, and equipped with a display component, operation component 33, etc.