To easily recognize an operator by providing image read parts on the top surfaces of an execution switch button or/and a reset switch button.

The execution switch button 2 and reset switch button 3 are installed on both the right and left front sides of the top surface of a mouse case 1, and the image read parts 4 and 5 are installed on the execution switch button 2 and reset switch button 3 respectively. Image signals form the image read parts 4 and 5 on the button are outputted from a control circuit 6 through a connection cord 10. Therefore, when an operator holds the mouse case 1 and touches the execution switch button 2 and reset switch button 3 with a finger, fingerprint data on the finger are read as dot data by the image read parts 4 and 5 and displayed on an image screen, so the operator can easily be recognized.