A portable communication device comprising: a housing including a first housing and a second housing; a hinge structure that connects the first housing and the second housing; a flexible display disposed over the first housing, the hinge structure, and the second housing; wherein the hinge structure includes: a first shaft gear (231_2) coupled with a first shaft body (231_1) and configured to rotate about a first axis; a second shaft gear (232_2) coupled with a second shaft body (232_1) and configured to rotate about a second axis; a first arm configured to rotate about the first axis and configured to rotate the first shaft gear (231_2); a second arm configured to rotate about the second axis and correspond to a rotation the second shaft gear (232_2); a first rotary bracket including a first rail (211_3) configured to rotate about a third axis different from the first axis while the first arm is rotated about the first axis; a second rotary bracket including a second rail (212_3) configured to rotate about a fourth axis different from the second axis while the second arm is rotated about the second axis; a fixed bracket configured to accommodate at least a portion of the first rotary bracket and at least a portion of the second rotary bracket, wherein the fixed bracket includes a first rail groove corresponding to the first rail (211_3) and a second rail groove corresponding to the second rail (212_3), wherein the first rotary bracket is configured to rotate about the third axis by sliding along to the first rail groove and the second rotary bracket is configured to rotate about the fourth axis by sliding along to the second rail groove; a first rotary cam (221_4) configured to rotate with the first shaft gear (231_2); a second rotary cam (222_4) configured to rotate with the second shaft gear (232_2); a first elastic body mounted on the first shaft body (231_1); a second elastic body mounted on the second shaft body (232_1); a first cam member engaged with the first rotary cam (221_4) and configured to apply pressure or release pressure to the first elastic body based on rotation of the first rotary cam (221_4); and a second cam member engaged with the second rotary cam (222_4) and configured to apply pressure or release pressure to the second elastic body based on rotation of the second rotary cam (222_4). a housing including a first housing and a second housing; a hinge structure that connects the first housing and the second housing; a flexible display disposed over the first housing, the hinge structure, and the second housing; a first shaft gear (231_2) coupled with a first shaft body (231_1) and configured to rotate about a first axis; a second shaft gear (232_2) coupled with a second shaft body (232_1) and configured to rotate about a second axis; a first arm configured to rotate about the first axis and configured to rotate the first shaft gear (231_2); a second arm configured to rotate about the second axis and correspond to a rotation the second shaft gear (232_2); a first rotary bracket including a first rail (211_3) configured to rotate about a third axis different from the first axis while the first arm is rotated about the first axis; a second rotary bracket including a second rail (212_3) configured to rotate about a fourth axis different from the second axis while the second arm is rotated about the second axis; a fixed bracket configured to accommodate at least a portion of the first rotary bracket and at least a portion of the second rotary bracket, wherein the fixed bracket includes a first rail groove corresponding to the first rail (211_3) and a second rail groove corresponding to the second rail (212_3), wherein the first rotary bracket is configured to rotate about the third axis by sliding along to the first rail groove and the second rotary bracket is configured to rotate about the fourth axis by sliding along to the second rail groove; a first rotary cam (221_4) configured to rotate with the first shaft gear (231_2); a second rotary cam (222_4) configured to rotate with the second shaft gear (232_2); a first elastic body mounted on the first shaft body (231_1); a second elastic body mounted on the second shaft body (232_1); a first cam member engaged with the first rotary cam (221_4) and configured to apply pressure or release pressure to the first elastic body based on rotation of the first rotary cam (221_4); and a second cam member engaged with the second rotary cam (222_4) and configured to apply pressure or release pressure to the second elastic body based on rotation of the second rotary cam (222_4).