To solve the problem that in a conventional casing, a side surface of a door having a rotating shaft installed therein is held down by a bearing plate provided with a bearing in a casing part, and therefore, the door does not stop in the middle of rotation, and hence, it takes time, and it is not so easy to handle because a hand and a finger or the like are caught between the door and an installation surface when the door is opened, and between the door and the casing when the door is closed.

In a casing door opening/closing mechanism for storing an electronic equipment, elastic bearing plates, which are respectively provided with a shaft or a shaft hole and are long in one direction, are attached to both side surfaces of the casing part. The door is stopped at an optional position in the middle of rotation by skid resistance occurred in the side surface of the door provided with the shaft hole or the shaft in a shaft side surface of the door, or a shaft side surface having a larger diameter than a bearing hole and having an inclination.