Earphone microphone

An earphone microphone comprising:

• a single speaker;
• a microphone having first and second sound input holes;
• and
• a main body casing in which an acoustic space is formed, wherein
• the acoustic space includes a sound output path in which output sound from the speaker propagates, a first sound input path communicating with outside of the main body casing, in which sound to be input to the first sound input hole propagates, and a second sound input path in which sound to be input to the second sound input hole propagates,
• the sound output path branches into one path communicating with the outside of the main body casing and the other path communicating with the second sound input path, and
• input sound from a sound source outside the main body casing is input while input of the output sound from the speaker is suppressed by acoustic resistance of the acoustic space.