A composite lighting device is provided, which is inexpensive and has high uniformity in brightness, in which light emitted from an end face of a backlight having an organic EL device is used to illuminate input buttons and the like. Embodiments include etching an Al or Al alloy layer employing fluorine andor chlorine chemistry, wet cleaning, treating with a nitrogen-containing plasma at a temperature of at least about 400 C. Upon a given stroke of the piston, at least one switch engages a device detecting hydraulic pressure inside the cylinder on one or both sides of the piston.