PURPOSE: To attain the finer control of the speed of a zooming action, etc., by making the light enter through a single end face of a 1st transparent elastic matter as well as a touch panel where a 2nd elastic matter having a lower refractive index is laminated on both sides of the 1st elastic matter having a higher refractive index.

CONSTITUTION: The light beams emitted from the light emitting elements 7 and 14 are made incident through a single end face of a 1st elastic matter 1 when a touch surface 20 of a 2nd elastic matter 3 is not pushed. The transmitted beams are outputted through the opposite side of the matter 1 and made incident on the light receiving elements 11 and 18 through the polarizing plates 12 and 19. When the surface 20 of the matter 3 is pushed, the matter 1 sinks at the pressed area and the transmitting areas are reduced for the beams sent from the 1st and 2nd light emitting sources 6 and 13. Thus the light beam reaching the 1st and 2nd photodetectors 10 and 17 are reduced and can be detected as the changes of the electric signals. Furthermore the quantity of the beams made incident on both photodetectors 10 and 17 can be varied with control of the pressing force of the surface 20. Then the electric signal can be optionally changed.