A foldable electronic device comprising: a flexible display; a first housing and a second housing; a hinge housing; and a hinge structure, at least a portion of which is seated in the hinge housing, wherein the hinge structure includes: a first rotary member coupled to the first housing; a second rotary member coupled to the second housing; a first arm part coupled to the first rotary member and including a first rotary cam; a second arm part coupled to the second rotary member and including a second rotary cam; a fixed cam part including a first fixed cam engaged with the first rotary cam, a second fixed cam engaged with the second rotary cam, and a cam body connecting the first fixed cam and the second fixed cam; a stopper configured to restrict rotational angles of the first arm part and the second arm part; and characterized in that the hinge structure further includes: an additional structure disposed between the stopper and the fixed cam part, having a shape corresponding to at least an area of a surface of the cam body which faces the stopper, and having a specific thickness such as to remove at least a portion of a pressure applied between the first rotary cam of the first arm part and the first fixed cam and between the second rotary cam and the second fixed cam in a closed state of the foldable electronic device. a flexible display; a first housing and a second housing; a hinge housing; and a hinge structure, at least a portion of which is seated in the hinge housing, wherein the hinge structure includes: a first rotary member coupled to the first housing; a second rotary member coupled to the second housing; a first arm part coupled to the first rotary member and including a first rotary cam; a second arm part coupled to the second rotary member and including a second rotary cam; a fixed cam part including a first fixed cam engaged with the first rotary cam, a second fixed cam engaged with the second rotary cam, and a cam body connecting the first fixed cam and the second fixed cam; a stopper configured to restrict rotational angles of the first arm part and the second arm part; and a first rotary member coupled to the first housing; a second rotary member coupled to the second housing; a first arm part coupled to the first rotary member and including a first rotary cam; a second arm part coupled to the second rotary member and including a second rotary cam; a fixed cam part including a first fixed cam engaged with the first rotary cam, a second fixed cam engaged with the second rotary cam, and a cam body connecting the first fixed cam and the second fixed cam; a stopper configured to restrict rotational angles of the first arm part and the second arm part; and characterized in that the hinge structure further includes: an additional structure disposed between the stopper and the fixed cam part, having a shape corresponding to at least an area of a surface of the cam body which faces the stopper, and having a specific thickness such as to remove at least a portion of a pressure applied between the first rotary cam of the first arm part and the first fixed cam and between the second rotary cam and the second fixed cam in a closed state of the foldable electronic device.