An electronic device comprising: a front cover and a rear cover forming a part of an outer appearance of the electronic device ; an array antenna (AR1) comprising a plurality of antenna elements (510, 520, 530. 540) disposed between the front cover and the rear cover ; and a support member disposed between the front cover and the rear cover , wherein the support member is configured to: support a display of the electronic device , and extend to a lateral surface of the electronic device to form at least in part a lateral appearance of the electronic device , the support member comprising: a conductive first portion forming the lateral appearance of the electronic device ; a second portion adjacent to the array antenna (AR1), the front cover , and the conductive first portion , and comprising at least one opening filled with a non-conductive material; and a third portion comprising a non-conductive material and disposed adjacent to the array antenna (AR1), the rear cover , and the conductive first portion , wherein the conductive first portion is exposed to an outside of the electronic device , and the second portion and the third portion are hidden by the front cover and the rear cover so as not to be exposed to the outside, and wherein the array antenna (AR1) is configured to radiate a beam to the outside through the at least one opening and the third portion . a front cover and a rear cover forming a part of an outer appearance of the electronic device ; an array antenna (AR1) comprising a plurality of antenna elements (510, 520, 530. 540) disposed between the front cover and the rear cover ; and a support member disposed between the front cover and the rear cover , wherein the support member is configured to: support a display of the electronic device , and extend to a lateral surface of the electronic device to form at least in part a lateral appearance of the electronic device , support a display of the electronic device , and extend to a lateral surface of the electronic device to form at least in part a lateral appearance of the electronic device , the support member comprising: a conductive first portion forming the lateral appearance of the electronic device ; a second portion adjacent to the array antenna (AR1), the front cover , and the conductive first portion , and comprising at least one opening filled with a non-conductive material; and a third portion comprising a non-conductive material and disposed adjacent to the array antenna (AR1), the rear cover , and the conductive first portion , wherein the conductive first portion is exposed to an outside of the electronic device , and the second portion and the third portion are hidden by the front cover and the rear cover so as not to be exposed to the outside, and wherein the array antenna (AR1) is configured to radiate a beam to the outside through the at least one opening and the third portion . a conductive first portion forming the lateral appearance of the electronic device ; a second portion adjacent to the array antenna (AR1), the front cover , and the conductive first portion , and comprising at least one opening filled with a non-conductive material; and a third portion comprising a non-conductive material and disposed adjacent to the array antenna (AR1), the rear cover , and the conductive first portion , wherein the conductive first portion is exposed to an outside of the electronic device , and the second portion and the third portion are hidden by the front cover and the rear cover so as not to be exposed to the outside, and wherein the array antenna (AR1) is configured to radiate a beam to the outside through the at least one opening and the third portion . <EOS>