To make mountable a light emitting element, a light receiving element and a panel switch to constitute a touch switch part on one printed circuit board even when the sliding direction of the panel switch is not perpendicular to a display surface of a display.

The panel device is constituted by providing a light guiding member 10 on the light emitting side to reflect light emitted from the light emitting element 1 on the display surface 100a of the display 100 and a light guiding member 11 on the light receiving side to reflect light passed on the display surface 100a and to make it to be incident on the light receiving element 2 and mounting the light emitting element 1, the light receiving element 2 and the panel switch 9 on one printed circuit board 33.