A reaction area in a display can be enlarged from one directly above a switch display in the operator's eyesight direction. Specifically, the operator's position is determined from the driver's position or the like, and when the display is looked at to the right and upward, for instance, the reaction area is enlarged to the right and downward of a switch on the front side in the eyesight direction. Thus, operability can be improved in both cases when the display is looked at obliquely and diretly from the front.