There is provided a technique which can reduce the entire thickness of a push-button switch while securing the brightness of the illumination and can increase the sensitivity and accuracy of a slide input. Use of a light guide sheet separating from a surface-type capacitance sensor is excluded, thereby being able to reduce the entire thickness of a sensor-integrated illuminated key sheet while a light guide sheet serves to secure the brightness of the illumination. A surface sheet is provided so as to contact the operation surface side of the light guide sheet as the substrate of the surface-type capacitance sensor. The distance between the operation surface of the surface sheet and the surface-type capacitance sensor can therefore decrease, which can enhance the sensitivity and accuracy of the slide input.