Japanese Patent Application Publication No. 2006-215738 (JP2006-215738A) discloses a display apparatus with a touch panel using a piezoelectric actuator. The display apparatus includes a touch panel provided with a touch switch and a piezoelectric actuator mechanically connected to the touch panel. The piezoelectric actuator includes a metal diaphragm, piezoelectric elements formed on a front surface and a back surface of the metal diaphragm, and a pair of input electrodes. The piezoelectric elements each include a first electrically conductive layer, a second electrically conductive layer, and a piezoelectric layer. The first and second electrically conductive layers are stacked or overlaid via the piezoelectric layer. The first electrically conductive layer is electrically connected to one of the input electrodes. The second electrically conductive layer is connected to the metal diaphragm. The metal diaphragm is electrically connected to the other input electrode. When an operator touches the surface of the touch panel of the display apparatus with a finger, the touch switch detects that touch panel is touched by the operator and turns on the switch. Once the switch has properly been turned on, a current flows across the pair of input electrodes of the piezoelectric actuator to vibrate the piezoelectric actuator. Then, the touch panel vibrates. Thus, even an operator with visual or aural disabilities may tactually recognize that the switch has properly been turned.