Headset including in-ear microphone

A headset comprising an in-ear microphone, comprising:

• a housing;
• a seating portion comprising an external hole which protrudes outwards from a surface of the housing and penetrates from the surface of the housing to the protruding end surface;
• a first frame inserted and seated in the seating portion and comprising a first surface toward a first direction, a second surface toward a second direction opposite to the first direction, and a side surface surrounding at least part of a space between the first surface and the second surface;
• a speaker seating portion formed by recessing by a specific depth from a first portion of the first surface toward the second surface;
• a space formed between a lower end of an inner surface of the seating portion facing the second surface and the second surface with the first frame seated;
• a speaker hole formed by penetrating from the speaker seating portion to the space through the second surface;
• a microphone hole penetrated from a second portion of the first surface to the space;
• an acoustic hole formed by penetrating the inner surface of the seating portion from the space and connecting with the external hole;
• a speaker seated in the speaker seating portion;
• a first printed circuit board disposed on the second portion and having a via hole connected with the microphone hole;
• a second printed circuit board electrically connected with the first printed circuit board and a connection unit of the speaker;
• and
• a microphone mounted at a position aligned with the via hole on the first printed circuit board.