PURPOSE: To allow an operator to select one key ring, press it from an upper part, and command a selected function by rotating a key rotary shaft supported so as to be freely rotatable, and stopping the key ring at a desired position.

CONSTITUTION: Side walls 20 and 21 are provided so as to be opposed to each other at a case main body 6, and the key rotary shaft constituted of a shaft 1 is suspended while the both edges are supported. Four cylindrical key rings 2a, 2b, 2c, and 2d with an elastic body 3 constituted of a soft rubber or sponge or the like interposed inside which ring about the contact surface of the shaft 1 are attached to the shaft 1. Then, two cams 7a and 7b are attached to one side of the shaft 1 as a rotary position detecting means, and position detecting switches 9a and 0b are arranged on a print circuit board 5. When the upper side contact surface of the key ring 2 is pressed, the elastic body 3 is reduced and transformed, the key ring 2 is moved downward, and a switch 4 arranged at the lower part of the key ring 2 is pressed.