An electronic device, comprising: a housing comprising a front plate facing in a first direction and a back plate facing in a second direction opposite to the first direction; a display mounted on at least one surface of the housing; a battery; a supporting member (530, 730) disposed adjacent to a back surface of the display and supporting the display; a printed circuit board (550a, 550b) on which electronic components (551, 552, 553a, 553b, 553c) are mounted; a shield can (554a, 554b) surrounding at least a portion of the electronic (551, 552, 553a, 553b, 553c) components; and a shielding structure disposed on an outer surface of the shield can (554a, 554b) to shield the electronic components (551, 552, 553a, 553b, 553c); characterized in that: a first heat transfer member is disposed on an outer surface of the shielding structure and includes a partial area that faces at least one electronic component among the electronic components (551, 552, 553a, 553b, 553c) mounted on the printed circuit board (550a, 550b) and another partial area that is bent and faces another electronic component among the electronic components (551, 552, 553a, 553b, 553c) mounted on the printed circuit board (550a, 550b); at least one antenna module (791, 792) is vertically mounted on the supporting member (530, 730) by a heat transfer metal frame (791c, 792c) such that a radiating surface of the at least one antenna module (791, 792) faces a side surface of the electronic device; and a first heat radiating sheet (782, 783) is disposed on the back plate (580, 780) of the housing to cover a surface of the at least one antenna module (791, 792), and the heat transfer metal frame (791c, 792c) is disposed on the at least one antenna module (791, 792). a housing comprising a front plate facing in a first direction and a back plate facing in a second direction opposite to the first direction; a display mounted on at least one surface of the housing; a battery; a supporting member (530, 730) disposed adjacent to a back surface of the display and supporting the display; a printed circuit board (550a, 550b) on which electronic components (551, 552, 553a, 553b, 553c) are mounted; a shield can (554a, 554b) surrounding at least a portion of the electronic (551, 552, 553a, 553b, 553c) components; and a shielding structure disposed on an outer surface of the shield can (554a, 554b) to shield the electronic components (551, 552, 553a, 553b, 553c); characterized in that: a first heat transfer member is disposed on an outer surface of the shielding structure and includes a partial area that faces at least one electronic component among the electronic components (551, 552, 553a, 553b, 553c) mounted on the printed circuit board (550a, 550b) and another partial area that is bent and faces another electronic component among the electronic components (551, 552, 553a, 553b, 553c) mounted on the printed circuit board (550a, 550b); at least one antenna module (791, 792) is vertically mounted on the supporting member (530, 730) by a heat transfer metal frame (791c, 792c) such that a radiating surface of the at least one antenna module (791, 792) faces a side surface of the electronic device; and a first heat radiating sheet (782, 783) is disposed on the back plate (580, 780) of the housing to cover a surface of the at least one antenna module (791, 792), and the heat transfer metal frame (791c, 792c) is disposed on the at least one antenna module (791, 792). a first heat transfer member is disposed on an outer surface of the shielding structure and includes a partial area that faces at least one electronic component among the electronic components (551, 552, 553a, 553b, 553c) mounted on the printed circuit board (550a, 550b) and another partial area that is bent and faces another electronic component among the electronic components (551, 552, 553a, 553b, 553c) mounted on the printed circuit board (550a, 550b); at least one antenna module (791, 792) is vertically mounted on the supporting member (530, 730) by a heat transfer metal frame (791c, 792c) such that a radiating surface of the at least one antenna module (791, 792) faces a side surface of the electronic device; and a first heat radiating sheet (782, 783) is disposed on the back plate (580, 780) of the housing to cover a surface of the at least one antenna module (791, 792), and the heat transfer metal frame (791c, 792c) is disposed on the at least one antenna module (791, 792).