Revolving contact-points board (2) is provided with a ring contact-point (8) sand a radial contact-point (9) on the bottom surface, while fitting substrate (1) is provided with an elastic contact-point 11 for switch and elastic contact-points (13, 14) for revolution signal. Underneath the fitting substrate (1), a sliding plate (7) made of an elastic metal sheet is provided for regulating the movement in horizontal direction of the revolving contact-points board 2. With a push of the round operation knob (3) fixed on the revolving contact-points board (2) in the horizontal direction, the ring contact-point (8) makes contact with the contact-point (11) to generate a switch signal. With a revolution of the operation knob (3), the radial contact-point (9) makes contact with the contact-points (13, 14) to generate a pulse signal.