Abstract: A compact operation device that illuminates illumination windows with a simple structure and has a high level of design freedom. The operation device has an ornamental panel including operation portions and illumination windows. An elastomeric sheet below the ornamental panel is resiliently deformed by the operation portions. Contacts are arranged on the elastomeric sheet. A circuit board is arranged adjacent to the elastomeric sheet. Switches are arranged on the circuit board in correspondence with the contacts. The switches contact the contacts when the elastomeric sheet is deformed. A light guide arranged on the circuit board guides light from a light source arranged on the circuit board to the illumination portions. Openings extend through the circuit board in correspondence with the illumination portions. The light guide includes a reflection structure for reflecting light from the light source toward the openings.