An electronic device (101, 200, 1110) comprising: a foldable housing (210, 220) at least partially foldable via a hinge; a display including a flexible display panel viewable through a front surface of the foldable housing and being at least partially foldable, and a conductive plate disposed on a rear surface of the flexible display panel and supporting the flexible display panel; a circuit board disposed to face at least a portion of a border of the conductive plate in the foldable housing; and at least one conductive connection member comprising a conductor disposed between the conductive plate and the circuit board and electrically connecting the conductive plate and a ground of the circuit board, wherein the foldable housing includes a side bezel (213, 223) at least partially covering side surfaces of the electronic device, the side bezel including a first conductive section having a dividing portion and configured to function as an antenna and a second conductive section other than the first conductive section, and the circuit board is disposed in at least a portion of the second conductive section, wherein the side bezel includes a first side portion and a second side portion disposed respectively at both sides of the hinge with a folding axis of the hinge therebetween, wherein the first side portion has a first side surface disposed in parallel with the folding axis, a second side surface extending perpendicular to the folding axis from an end of the first side surface, and a third side surface extending perpendicular to the folding axis from another end of the first side surface, wherein the second side portion has a fourth side surface disposed in parallel with the folding axis, a fifth side surface extending perpendicular to the folding axis from an end of fourth side surface, and a sixth side surface extending perpendicular to the folding axis from another end of the fourth side surface, and wherein the circuit board is disposed on the first side surface or the fourth side surface, wherein the first side surface or the fourth side surface of the side bezel includes a groove (1531, 7212) in which the circuit board is seated. a foldable housing (210, 220) at least partially foldable via a hinge; a display including a flexible display panel viewable through a front surface of the foldable housing and being at least partially foldable, and a conductive plate disposed on a rear surface of the flexible display panel and supporting the flexible display panel; a circuit board disposed to face at least a portion of a border of the conductive plate in the foldable housing; and at least one conductive connection member comprising a conductor disposed between the conductive plate and the circuit board and electrically connecting the conductive plate and a ground of the circuit board, wherein the foldable housing includes a side bezel (213, 223) at least partially covering side surfaces of the electronic device, the side bezel including a first conductive section having a dividing portion and configured to function as an antenna and a second conductive section other than the first conductive section, and the circuit board is disposed in at least a portion of the second conductive section, wherein the side bezel includes a first side portion and a second side portion disposed respectively at both sides of the hinge with a folding axis of the hinge therebetween, wherein the first side portion has a first side surface disposed in parallel with the folding axis, a second side surface extending perpendicular to the folding axis from an end of the first side surface, and a third side surface extending perpendicular to the folding axis from another end of the first side surface, wherein the second side portion has a fourth side surface disposed in parallel with the folding axis, a fifth side surface extending perpendicular to the folding axis from an end of fourth side surface, and a sixth side surface extending perpendicular to the folding axis from another end of the fourth side surface, and wherein the circuit board is disposed on the first side surface or the fourth side surface, wherein the first side surface or the fourth side surface of the side bezel includes a groove (1531, 7212) in which the circuit board is seated.