An exterior cover of an electronic device is provided. the exterior cover includes a cover portion including a front surface facing in a first direction, a rear surface facing in a second direction opposite to the first direction, and a recess formed on the rear surface; and a support member having a shape corresponding to the recess and including a magnetic material accommodated therein to be detachably provided on the rear surface of the cover portion. The cover portion includes at least one metallic member disposed inside thereof, and the at least one metallic member at least partially overlaps the recess.