A case of a disk device has an open-topped rectangular base and a top cover in the form of a rectangular plate screwed to the base. A label is pasted on the top cover. Provided in the case are a disk-shaped recording medium, a head for recording and reproducing information to and from the recording medium, and a mechanical section. The top cover has a depression formed by drawing, the label is pasted on the top cover so as to cover the depression, and at least a part of the depression is exposed to form an opening portion.