There is provided an electronic device that enables and ensures the detection of the open/close condition and attached condition of a plurality of cover bodies by only one detection switch. Therefore, an electronic device comprises an upper cover, a front cover, an actuator, and a mechanical switch. The upper cover is provided openable and closable with respect to a rolled sheet holder storing case, and the front cover is removably attached on the rolled sheet holder storing case for covering a component, which is housed in the rolled sheet holder storing case. The actuator is provided on the front cover, and it makes an action when the upper cover is closed to the rolled sheet holder storing case, and the mechanical switch detects the action of the actuator. This arrangement forms a system that detects sequentially the action taken for closing the upper cover to the rolled sheet holder storing case, by relaying the action via the actuator, which is provided on the front cover, to the mechanical switch, which detects the action.