The audio output apparatus according to any one of (1) to (6), in which
the rotating body includes a circumferential surface whose one end is continuous with an outer periphery of the relative surface, and
the circumferential surface is formed into a curved surface.
(8)
The audio output apparatus according to any one of (1) to (7), in which
the base body is formed in a tapered shape whose outer circumference becomes smaller as the base body is farther away from the rotating body.
(9)
The audio output apparatus according to (8), in which
the base body is formed in a substantially conical shape.
(10)
The audio output apparatus according to (8) or (9), in which
an outer surface of a tip side portion of the base body is formed in a curved shape convex toward the tip side.
(11)
The audio output apparatus according to any one of (1) to (10), in which
the base body includes an enclosure and an earpiece, the enclosure including a placement space that is formed inside the enclosure, the earpiece being in close contact with at least part of an outer surface of the enclosure, and
the earpiece includes an elastically deformable material.
(12)
The audio output apparatus according to (11), in which