An electronic device comprising: a housing including a first plate , a second plate facing away from the first plate , and a side member surrounding a space between the first plate and the second plate and including an opening ; a touch screen display exposed through the first plate ; and an earphone jack assembly disposed to align with the opening , wherein the earphone jack assembly includes: at least one earphone jack housing including a first passage having a first cross-sectional area, and a third passage , wherein the first passage extends from the opening in a first direction to accommodate an external earphone connector, and includes a first end connected to the opening and a second end opposite to the first end , and the third passage extends in a second direction different from the first direction; and a microphone disposed outside of the at least one earphone jack housing and including a substrate having a hole connected to the third passage, characterized in that a second passage is arranged between the first passage and the third passage ; wherein the second passage has a second cross-sectional area that is smaller than the first cross-sectional area and extends from the second end of the first passage in the first direction; and the third passage extends from the second passage in the second direction. a housing including a first plate , a second plate facing away from the first plate , and a side member surrounding a space between the first plate and the second plate and including an opening ; a touch screen display exposed through the first plate ; and an earphone jack assembly disposed to align with the opening , wherein the earphone jack assembly includes: at least one earphone jack housing including a first passage having a first cross-sectional area, and a third passage , wherein the first passage extends from the opening in a first direction to accommodate an external earphone connector, and includes a first end connected to the opening and a second end opposite to the first end , and the third passage extends in a second direction different from the first direction; and a microphone disposed outside of the at least one earphone jack housing and including a substrate having a hole connected to the third passage, at least one earphone jack housing including a first passage having a first cross-sectional area, and a third passage , wherein the first passage extends from the opening in a first direction to accommodate an external earphone connector, and includes a first end connected to the opening and a second end opposite to the first end , and the third passage extends in a second direction different from the first direction; and a microphone disposed outside of the at least one earphone jack housing and including a substrate having a hole connected to the third passage, characterized in that a second passage is arranged between the first passage and the third passage ; wherein the second passage has a second cross-sectional area that is smaller than the first cross-sectional area and extends from the second end of the first passage in the first direction; and the third passage extends from the second passage in the second direction. <EOS>