To assemble an aerial wire with good appearance in a simple manner by utilizing equipment existing in a housing without deteriorating a protection function for internal devices.

A cubicle 1 has a metal housing 2. A wireless transmission/reception unit is installed inside the housing 2. Operation information on an electrical device is communicated with an external unit. A perspective window assembly 9 and a grip assembly 10 as standard equipment are provided at a front door 6 of the housing 2 so as to be exposed to an external surface of the housing 2. The perspective window assembly 9 comprises a window grass 12 covering an opening of the front door 6, and a window frame 13 holding the window glass 12 at the front door 6. The window frame 13 is molded of a non-conductive material, and an aerial wire 16 is assembled to a longitudinal direction groove of the window frame 13 and connected with the wireless transmission/reception unit via a communication wire. A holder made of a non-conductive material may be attached to the grip assembly 10, and the aerial wire may be assembled to the holder.