Ear device, ear-mounted unit, and method for switching mounting state of ear device

A method for switching a mounting state of an ear device that includes:

• a housing that is to be fit in a cavum conchae of an ear of a user;
• and
• a sound emission rod that is supported by the housing and has a sound hole through which sound is emitted, the sound hole being provided in a free end portion of the sound emission rod,
• the method comprising
• moving the sound emission rod in an axial direction of the sound emission rod relative to the housing by a user operation, so as to switch the mounting state between:
• a closed state in which at least the free end portion of the sound emission rod is to be inserted inside an external auditory meatus of the ear;
• and
• an open state in which the sound emission rod is to be placed outside the external auditory meatus.