<p>On a front door (15) of a unit room (2) for housing a mobile equipment (1) of a switchboard, an opening (5a) is formed, through which at least parts of an operation portion (1b) and a handle (1c) both provided on the mobile equipment (1) are projected toward the outside. A dust protective cover (6) is also mounted on the front door (15), the cover (6) covering the opening (5a) while at least the parts of the operation portion (1b) and the handle (1c) both provided on the mobile equipment (1) are projected.</p>
