To improve the presence for an operator by moving a weight installed inside an input device based on the game result from a game machine accompanying the operation of a key pad on the input device.

This device is composed of a transmission part 7 for reporting the start or end information of a game through the pressing of a start/end button and transmitting move information, for which the input data of the key pad are converted, to the main body of game machine, control part 6 for calculating the difference between a weight move information received from the main body of game machine and a weight move information received the last time and stored in a storage part 9 and reporting the weight move information of this difference, and weight driving part 10 for converting the weight move information of the difference to a pulse for driving a motor, driving an X-axis motor part 11 or a Y-axis motor part 12 and moving the weight in an input device 1 in X-axis or Y-axis direction. Thus, since the weight to be loaded to right and left hands supporting the input device is changed, the sense of balance is changed to increase the presence of the game.