To reduce an occupied area of a PC system by mounting a key board onto a cover so that the key board is not fallen down even when the cover is open or by configuring the cover and the key board integrally.

A computer key board 10 and/or a list pad 12 are arranged to an upper part of a scanner cover and mounted thereon. The computer key board 10 and the list pad 12 are fixed onto the scanner cover 26 by an adhesives, clips, screws or other optional mount means to prevent the computer key board 10 and the list pad 12 from being slipped out of the scanner cover when the scanner cover 26 is lifted up to scan a document or other object. Or the computer key board 10 and the list pad 12 are inserted to the scanner cover 26 separately to be mounted onto the scanner cover 26. Or the computer key board 10 and the list pad 12 are integrated with the scanner cover 26.