To suppress sliding of a hinge in the longitudinal direction of an electronic device in order to prevent displacement of a cover for a BOX chassis, even when the cover is repeatedly opened and closed; in a structure of the electronic device in which a pin rotates within a hole in the case where the cover is mounted to the BOX chassis, and the cover is opened and closed because the pin of hinge mounted to the BOX chassis is inserted into the hole of the hinge (not shown) provided to the cover.

Displacement of the cover for the BOX chassis can be prevented by suppressing slide of the hinge by allowing the hinge to abut on a stopper 14 when the hinge starts to slide on the occasion that the cover is opened and closed, because the stopper 14 is mounted to the part near the hinge of the BOX chassis.