Abstract: An object of the present invention is to provide a control-key device having a shape such that the control-key device easily fits the hands of an operator. The control-key device has a top case 11 and a bottom case 12 having a curved shape. The control-key device has three circuit substrates 81, 82 and 83 having angles formed therebetween so that the curved shape of the top case and bottom case matches these the three circuit substrates. Rubber contact members 70, 63 and 22 are placed on the circuit substrates, push buttons 31, 32, 33 and 60 and a direction specifying key 20 being placed thereon.