A vehicle sound generator apparatus comprising: a vehicle state sensing unit for sensing an operation state of a vehicle; a storage unit comprising a sound source storage unit for storing a plurality of operating sounds that can be output according to the operation state of the vehicle in the form of a sound source data; a sound source playback unit for selecting at least one of the operating sounds stored in the sound source storage unit, and playing back the selected sound source output from the sound source storage unit; a sound source amplification unit for amplifying the operating sound played back by the sound source playback unit; a sound output unit for outputting the operating sound amplified by the sound source amplification unit; and a control unit for receiving a sensing signal from the vehicle state sensing unit and controlling the operation of the sound source playback unit so as to play back the operating sound in different playback methods in such a manner as to control and change the operating sound according to the received sensing signal, wherein the vehicle state sensing unit is configured to sense a vehicle speed, and wherein the control unit calculates a corresponding shifting factor from a velocity shifting profile to correspond to the vehicle speed, and controls and outputs the sound pressure or the pitch of the operating sound the sound generator being characterized in that it comprises: a reference data storage unit for storing the velocity shifting profile including a shifting factor that controls a sound pressure or a pitch each of the operating sounds with respect to a speed of the vehicle; and wherein the velocity shifting profile includes the shifting factor that controls the sound pressure or the pitch of each of the operating sounds with respect to the vehicle speed in such a manner to include a plurality of shifting boundary nodes each having a value of the shifting factor for a section boundary speed of a vehicle speed section with the vehicle speed divided by section, wherein the shifting factor within the vehicle speed section is calculated from a previous shifting node having a value for the shifting factor for the vehicle speed in a previous step on the velocity shifting profile, and a shifting boundary node for any one of anterior and posterior section boundary speeds of a corresponding vehicle speed section. a vehicle state sensing unit for sensing an operation state of a vehicle; a storage unit comprising a sound source storage unit for storing a plurality of operating sounds that can be output according to the operation state of the vehicle in the form of a sound source data; a sound source playback unit for selecting at least one of the operating sounds stored in the sound source storage unit, and playing back the selected sound source output from the sound source storage unit; a sound source amplification unit for amplifying the operating sound played back by the sound source playback unit; a sound output unit for outputting the operating sound amplified by the sound source amplification unit; and a control unit for receiving a sensing signal from the vehicle state sensing unit and controlling the operation of the sound source playback unit so as to play back the operating sound in different playback methods in such a manner as to control and change the operating sound according to the received sensing signal, wherein the vehicle state sensing unit is configured to sense a vehicle speed, and wherein the control unit calculates a corresponding shifting factor from a velocity shifting profile to correspond to the vehicle speed, and controls and outputs the sound pressure or the pitch of the operating sound the sound generator being characterized in that it comprises: a reference data storage unit for storing the velocity shifting profile including a shifting factor that controls a sound pressure or a pitch each of the operating sounds with respect to a speed of the vehicle; and wherein the velocity shifting profile includes the shifting factor that controls the sound pressure or the pitch of each of the operating sounds with respect to the vehicle speed in such a manner to include a plurality of shifting boundary nodes each having a value of the shifting factor for a section boundary speed of a vehicle speed section with the vehicle speed divided by section, wherein the shifting factor within the vehicle speed section is calculated from a previous shifting node having a value for the shifting factor for the vehicle speed in a previous step on the velocity shifting profile, and a shifting boundary node for any one of anterior and posterior section boundary speeds of a corresponding vehicle speed section.