In a front panel in which a design sheet, a touch panel, and a metal sheet are integrated, the touch panel is bonded to a back face of the design sheet with an optical transparent double-sided tape. The metal sheet is formed in a frame shape to surround a periphery of the touch panel and to have an outer shape which is identical to an outer shape of the design sheet and is bonded to the back face of the design sheet with an adhesive or a double-sided tape.