An electronic device comprising: a first housing; a second housing; a hinge structure connected to the first housing and the second housing, the first housing being rotatable about a first rotation axis and the second housing being rotatable about a second rotation axis, the first rotation axis and the second rotation axis being parallel to an axial direction; and a display covering the first housing, the second housing, and the hinge structure, wherein the display includes a folding area that is flat in an unfolded state and curved in a folded state, and wherein the hinge structure comprises: a first arm shaft extending in a direction that is parallel to the axial direction, the first arm shaft being connected to a fixing structure and configured to be rotatable about the first rotation axis, the first arm shaft being rotated in correspondence to a rotation of a first rotation structure; a second arm shaft extending in the direction that is parallel to the axial direction, the second arm shaft being connected to the fixing structure and configured to be rotatable about the second rotation axis, the second arm shaft being rotated in correspondence to a rotation of a second rotation structure; a link structure coupled to the first arm shaft and the second arm shaft, the link structure being configured to move linearly in the axial direction according to a rotation of the first arm shaft and the second arm shaft; and a center bar at least partially overlapping the folding area of the display when the hinge structure is viewed from a top position which is perpendicular to a rear surface of the display, the center bar being coupled to the link structure and movable in a direction that is perpendicular to the axial direction in correspondence to linear movement of the link structure. a first housing; a second housing; a hinge structure connected to the first housing and the second housing, the first housing being rotatable about a first rotation axis and the second housing being rotatable about a second rotation axis, the first rotation axis and the second rotation axis being parallel to an axial direction; and a display covering the first housing, the second housing, and the hinge structure, wherein the display includes a folding area that is flat in an unfolded state and curved in a folded state, and wherein the hinge structure comprises: a first arm shaft extending in a direction that is parallel to the axial direction, the first arm shaft being connected to a fixing structure and configured to be rotatable about the first rotation axis, the first arm shaft being rotated in correspondence to a rotation of a first rotation structure; a second arm shaft extending in the direction that is parallel to the axial direction, the second arm shaft being connected to the fixing structure and configured to be rotatable about the second rotation axis, the second arm shaft being rotated in correspondence to a rotation of a second rotation structure; a link structure coupled to the first arm shaft and the second arm shaft, the link structure being configured to move linearly in the axial direction according to a rotation of the first arm shaft and the second arm shaft; and a center bar at least partially overlapping the folding area of the display when the hinge structure is viewed from a top position which is perpendicular to a rear surface of the display, the center bar being coupled to the link structure and movable in a direction that is perpendicular to the axial direction in correspondence to linear movement of the link structure. a first arm shaft extending in a direction that is parallel to the axial direction, the first arm shaft being connected to a fixing structure and configured to be rotatable about the first rotation axis, the first arm shaft being rotated in correspondence to a rotation of a first rotation structure; a second arm shaft extending in the direction that is parallel to the axial direction, the second arm shaft being connected to the fixing structure and configured to be rotatable about the second rotation axis, the second arm shaft being rotated in correspondence to a rotation of a second rotation structure; a link structure coupled to the first arm shaft and the second arm shaft, the link structure being configured to move linearly in the axial direction according to a rotation of the first arm shaft and the second arm shaft; and a center bar at least partially overlapping the folding area of the display when the hinge structure is viewed from a top position which is perpendicular to a rear surface of the display, the center bar being coupled to the link structure and movable in a direction that is perpendicular to the axial direction in correspondence to linear movement of the link structure.