An electronic device (100, 700) 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 (140, 200, 300, 400, 500, 600) disposed to align with the opening, wherein the earphone jack assembly includes: at least one earphone jack housing (201, 310, 410, 510, 610) including a first passage (211, 311, 411, 511) having a first cross-sectional area, and a third passage (313, 413, 512, 613), 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 (240, 330, 430, 530, 630) disposed outside of the at least one earphone jack housing (201, 310, 410, 510, 610)and including a substrate having a hole (231, 321) connected to the third passage, characterized in that a second passage (312, 412) is arranged between the first passage and the third passage (313, 413, 512, 613); wherein the second passage (312, 412) 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 (140, 200, 300, 400, 500, 600) disposed to align with the opening, wherein the earphone jack assembly includes: at least one earphone jack housing (201, 310, 410, 510, 610) including a first passage (211, 311, 411, 511) having a first cross-sectional area, and a third passage (313, 413, 512, 613), 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 (240, 330, 430, 530, 630) disposed outside of the at least one earphone jack housing (201, 310, 410, 510, 610)and including a substrate having a hole (231, 321) connected to the third passage, at least one earphone jack housing (201, 310, 410, 510, 610) including a first passage (211, 311, 411, 511) having a first cross-sectional area, and a third passage (313, 413, 512, 613), 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 (240, 330, 430, 530, 630) disposed outside of the at least one earphone jack housing (201, 310, 410, 510, 610)and including a substrate having a hole (231, 321) connected to the third passage, characterized in that a second passage (312, 412) is arranged between the first passage and the third passage (313, 413, 512, 613); wherein the second passage (312, 412) 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.