sound can be generated by reproductively reading out the informing sound data in response to an activated direction of any one of the operators in the operator unit 3 further whereas the preceding paragraphs have described the informing sound generated in response to activation of the direction indicating operator the present invention is not so limited for example the present invention is also applicable to generation of informing sound in response to activation of any one of other vehicle mounted devices capable of being operated in symmetrical or opposite directions such as the steering wheel clockwise and counterclockwise directions accelerator pedal brake pedal and clutch pedal depressing and releasing directions and speed shift device upshift and downshift directions or forward and rearward directions further whereas the informing sound generation control processing of the present invention has been described above as performed by the cpu 4 a of the sound generator device 4 the informing sound generation control processing may be performed by the control device 1 that is mainly engaged in control of the behavior of the vehicle in such a case it is only necessary that the control device 1 output sound control signals including informing sound generating deadening instructions to the sound generator device 4 so that the sound generator device 4 controls generation deadening of the informing sound and a selected characteristic of the informing sound on the basis of the sound control signals given from the control device 1 furthermore whereas the informing sound generation control processing of the present invention has been described above as implemented by a software program executed by the control device 1 or cpu 4.