An electronic device (20, 100, 200, 500, 900) comprising: a foldable housing comprising: a hinge structure comprising at least one first conductive portion, wherein the hinge structure comprises a hinge cover (230, 533, 830) to cover a foldable portion of the foldable housing, and wherein the hinge cover (230, 533, 830) comprises the at least one first conductive portion; a first housing structure connected to the hinge structure, and comprising a first surface oriented in a first direction, a second surface oriented in a second direction that is opposite to the first direction, and a first side member surrounding at least a part of a space between the first surface and the second surface and comprising at least one second conductive portion; and a second housing structure connected to the hinge structure, and comprising a third surface oriented in a third direction, a fourth surface oriented in a fourth direction that is opposite to the third direction, and a second side member surrounding at least a part of a space between the third surface and the fourth surface, the second housing structure being foldable with respect to the first housing structure about the hinge structure; the foldable housing is configured such that the first surface faces the third surface in a folded state of the foldable housing and the third direction is identical to the first direction in an unfolded state of the foldable housing; a flexible display extending from the first surface to the third surface; a wireless communication circuit electrically connected to the first conductive portion in the folded state and electrically connected to the second conductive portion in the unfolded state, and configured to transmit and/or receive a signal having a selected frequency; a switch configured to electrically connect the wireless communication circuit and the at least one first conductive portion in the folded state, and electrically connects the wireless communication circuit and the at least one second conductive portion in the unfolded state; and wherein at least a part of the hinge cover (230, 533, 830) is covered by the first housing structure and the second housing structure in the unfolded state, and is exposed between the first housing structure and the second housing structure in the folded state. a hinge structure comprising at least one first conductive portion, wherein the hinge structure comprises a hinge cover (230, 533, 830) to cover a foldable portion of the foldable housing, and wherein the hinge cover (230, 533, 830) comprises the at least one first conductive portion; a first housing structure connected to the hinge structure, and comprising a first surface oriented in a first direction, a second surface oriented in a second direction that is opposite to the first direction, and a first side member surrounding at least a part of a space between the first surface and the second surface and comprising at least one second conductive portion; and a second housing structure connected to the hinge structure, and comprising a third surface oriented in a third direction, a fourth surface oriented in a fourth direction that is opposite to the third direction, and a second side member surrounding at least a part of a space between the third surface and the fourth surface, the second housing structure being foldable with respect to the first housing structure about the hinge structure; the foldable housing is configured such that the first surface faces the third surface in a folded state of the foldable housing and the third direction is identical to the first direction in an unfolded state of the foldable housing; a flexible display extending from the first surface to the third surface; a wireless communication circuit electrically connected to the first conductive portion in the folded state and electrically connected to the second conductive portion in the unfolded state, and configured to transmit and/or receive a signal having a selected frequency; a switch configured to electrically connect the wireless communication circuit and the at least one first conductive portion in the folded state, and electrically connects the wireless communication circuit and the at least one second conductive portion in the unfolded state; and wherein at least a part of the hinge cover (230, 533, 830) is covered by the first housing structure and the second housing structure in the unfolded state, and is exposed between the first housing structure and the second housing structure in the folded state.