An electronic device is disclosed. An electronic device according to an embodiment includes a housing including a glass plate and a rear case that is combined with the glass plate to form an inner space, a bezel, disposed on at least one edge of the glass plate, including a light passage hole, a camera module disposed in the inner space in which a center of the light passage hole and an optical axis of the lens of the camera module coincide each other and a cover member for opening and closing the light passage hole, wherein the cover member includes a sliding button which includes a rack gear on a first surface and capable of performing a linearly reciprocating movement and a pinion gear that rotates according to the movement of the rack gear, and wherein the pinion gear is disposed on at least a part of the circumference at a position corresponding to the teeth meshing with the rack gear and the light passage hole and includes an open area for transmitting an incident light through the light passage hole.