Note that the enclosure 4 and the earpiece 5 may be integrally formed by another method such as, for example, the so-called insert molding in which the cavity of a molding die is filled with a molten material serving as a base material of the earpiece 5 in a state where the enclosure 4 is placed in the cavity.

Integrally forming the enclosure 4 and the earpiece 5 into the base body 2 makes it possible to reduce the number of parts in the audio output apparatus 1 and improve the strength of the base body 2.

In a state where the earpiece 5 is coupled to the enclosure 4, the sound output holes 9a, 9a in the enclosure 4 are individually aligned with the sound output holes 13a, 13a in the earpiece 5.

In the base body 2 configured as described above, the outer surface of the hole forming portion 10 in the cover portion 7 is designated as the facing surface 2a, the outer surface of the outer circumferential portion 12 in the earpiece 5 is designated as the outer circumferential surface 2b, and the outer surface of the tip portion 13 in the earpiece 5 is designated as the tip surface 2c.

The rotating body 3 is formed in a substantially cylindrical shape whose axial direction is along the left-right direction, and includes, for example, a metal material or a resin material.