A protection-cover opening/closing mechanism for a digital still camera includes an electromagnet having stator around which an electromagnetic coil is formed and a movable member, a first lever to which the movable member is pivotally attached at a first end portion and which receives a rotational force, a second lever which is able to reciprocate on a stationary member, which is engageable with a second end portion of the first lever, and which is pressed toward an initial position thereof. While a CD-R is being operated, current is applied to the electromagnetic coil to restrain the movable member on the stator and thereby prevent the first lever from rotating, and the movement of the second lever in the direction away from the initial position is limited due to the engagement between the first lever and the second lever, thereby locking a protection cover at a closed position.