Abstract: A plurality of exciters that outputs sound in a predetermined frequency band and a plurality of piezoelectric speakers that outputs sound in a frequency band higher than those of the exciters are provided, in which each of the plurality of exciters and the plurality of piezoelectric speakers is arranged in a space between an outer panel of a vehicle body and an interior member or on an inner surface side of the interior member, vibration generated in each of the exciters and the piezoelectric speakers is transmitted to the interior member, and a crossover frequency exists between a high range side in an output band of the exciters and a low range side in an output band of the piezoelectric speakers.