A wrist watch type wearable electronic device (101, 201, 301, 401, 402, 403, 601a, 601b, 601c, 701, 801, 901, 1001, 1101) comprising: an outer housing (210, 320, 410, 710, 810, 910, 1010) that comprises: a first surface facing a first direction, a second surface facing a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface; a display (160, 220, 330, 420, 720, 820, 1120) adapted to expose at least a portion of the display through the first surface of the outer housing; a printed circuit board, PCB, (360, 440, 740, 840, 940, 1040, 1140) arranged between the second surface of the outer housing and the display; a communication circuit arranged on or over the PCB; a ground member arranged at a portion of the PCB; a first conductive structure formed of at least one of the first surface of the outer housing or at least a portion of the side surface, the first conductive structure being electrically connected to the communication circuit; a first conductive plate arranged between the first surface and the second surface of the outer housing, the first conductive plate being electrically connected to at least one of the ground member or the first conductive structure; and a second conductive plate arranged between the first conductive plate and the second surface of the outer housing, the second conductive plate being electrically connected to at least one of the ground member or the first conductive structure, wherein the first conductive plate and the second conductive plate are connected to the PCB through a conductive member. an outer housing (210, 320, 410, 710, 810, 910, 1010) that comprises: a first surface facing a first direction, a second surface facing a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface; a first surface facing a first direction, a second surface facing a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface; a display (160, 220, 330, 420, 720, 820, 1120) adapted to expose at least a portion of the display through the first surface of the outer housing; a printed circuit board, PCB, (360, 440, 740, 840, 940, 1040, 1140) arranged between the second surface of the outer housing and the display; a communication circuit arranged on or over the PCB; a ground member arranged at a portion of the PCB; a first conductive structure formed of at least one of the first surface of the outer housing or at least a portion of the side surface, the first conductive structure being electrically connected to the communication circuit; a first conductive plate arranged between the first surface and the second surface of the outer housing, the first conductive plate being electrically connected to at least one of the ground member or the first conductive structure; and a second conductive plate arranged between the first conductive plate and the second surface of the outer housing, the second conductive plate being electrically connected to at least one of the ground member or the first conductive structure, wherein the first conductive plate and the second conductive plate are connected to the PCB through a conductive member.