[Object] To provide an acoustic output device capable of reproducing a more natural stereophonic sound giving a realistic sensation regardless of the influence of individual differences in the shapes of ears or an imperfection of the recording system or the reproducing system, through a combination of an air conduction sound and a bone conduction sound produced through bone conduction. [Solution] Provided is an acoustic output device including: an air conduction sound providing unit configured to provide an air conduction sound; and a bone conduction sound providing unit configured to provide a bone conduction sound. The bone conduction sound providing unit is positioned on a portion other than near an ear of a user when worn by the user. According to the an acoustic output device, it is possible to reproduce a stereophonic sound regardless of the influence of individual differences in the shapes of ears or an imperfection of the recording system or the reproducing system.