A foldable electronic device comprising: a first housing and a second housing; hinge structures (200a, 200b) connected to the first housing and the second housing; and a display, at least a portion of which is disposed over the first housing, the hinge structures, and the second housing, wherein the each hinge structure (200a, 200b) includes: a first rotary shaft configured to be rotated with respect to a first axis, a second rotary shaft configured to be rotated with respect to a second axis, a first arm part connected to the first rotary shaft; a second arm part connected to the second rotary shaft; a first rotation part connected to the first arm part and configured to be rotated with respect to a third axis; a second rotation part connected to the second arm part and configured to be rotated with respect to a fourth axis; a center bar disposed between the first rotary shaft and the second rotary shaft and disposed to face at least a portion of a rear surface of the display, wherein a fixing ring is formed on one side of the center bar in a second direction that is opposite to a first direction that faces the display and integrally formed with the center bar; and a stabilizer having a band or ring shape and configured to guide upward/downward movement of the center bar, wherein the one side of the stabilizer is coupled to the fixing ring. a first housing and a second housing; hinge structures (200a, 200b) connected to the first housing and the second housing; and a display, at least a portion of which is disposed over the first housing, the hinge structures, and the second housing, wherein the each hinge structure (200a, 200b) includes: a first rotary shaft configured to be rotated with respect to a first axis, a second rotary shaft configured to be rotated with respect to a second axis, a first arm part connected to the first rotary shaft; a second arm part connected to the second rotary shaft; a first rotation part connected to the first arm part and configured to be rotated with respect to a third axis; a second rotation part connected to the second arm part and configured to be rotated with respect to a fourth axis; a center bar disposed between the first rotary shaft and the second rotary shaft and disposed to face at least a portion of a rear surface of the display, wherein a fixing ring is formed on one side of the center bar in a second direction that is opposite to a first direction that faces the display and integrally formed with the center bar; and a stabilizer having a band or ring shape and configured to guide upward/downward movement of the center bar, wherein the one side of the stabilizer is coupled to the fixing ring. a first rotary shaft configured to be rotated with respect to a first axis, a second rotary shaft configured to be rotated with respect to a second axis, a first arm part connected to the first rotary shaft; a second arm part connected to the second rotary shaft; a first rotation part connected to the first arm part and configured to be rotated with respect to a third axis; a second rotation part connected to the second arm part and configured to be rotated with respect to a fourth axis; a center bar disposed between the first rotary shaft and the second rotary shaft and disposed to face at least a portion of a rear surface of the display, wherein a fixing ring is formed on one side of the center bar in a second direction that is opposite to a first direction that faces the display and integrally formed with the center bar; and a stabilizer having a band or ring shape and configured to guide upward/downward movement of the center bar, wherein the one side of the stabilizer is coupled to the fixing ring.