A unison ring (10, 110, 210) for a gas turbine engine including a compressor, a combustor, and a turbine, and for being located along an outer periphery of a casing of the gas turbine engine and coupled to variable stator vanes of the compressor, the unison ring (10, 110, 210) comprising: an annular body including fiber-reinforced resin or circular-arc bodies including the fiber-reinforced resin, the fiber-reinforced resin including resin and reinforcing fibers; and pin holes (21a, 22a) in which a pin is received in a radial direction orthogonal to an axial direction of the unison ring (10, 110, 210), whereby a main orientation of the reinforcing fibers of the fiber-reinforced resin is directed in a circumferential direction of the unison ring (10, 110, 210); the unison ring (10, 110, 210) further comprising: an inner plate including a first pin hole of the pin holes (21a, 21b) and main surfaces facing the radial direction, an outer plate including a second pin hole of the pin holes (21a, 21b) and main surfaces facing the radial direction, the inner plate and the outer plate being located concentrically, a coupling plate including main surfaces facing the axial direction, the coupling plate coupling the inner plate to the outer plate, and at least one flange plate portion including main surfaces facing the axial direction, the at least one flange plate portion projecting in the radial direction from at least one of an end of the inner plate in the axial direction or an end of the outer plate in the axial direction; and the at least one flange plate portion comprising a pair of inner flange plates projecting inward in the radial direction from both ends of the inner plate in the axial direction. an annular body including fiber-reinforced resin or circular-arc bodies including the fiber-reinforced resin, the fiber-reinforced resin including resin and reinforcing fibers; and pin holes (21a, 22a) in which a pin is received in a radial direction orthogonal to an axial direction of the unison ring (10, 110, 210), whereby a main orientation of the reinforcing fibers of the fiber-reinforced resin is directed in a circumferential direction of the unison ring (10, 110, 210); the unison ring (10, 110, 210) further comprising: an inner plate including a first pin hole of the pin holes (21a, 21b) and main surfaces facing the radial direction, an outer plate including a second pin hole of the pin holes (21a, 21b) and main surfaces facing the radial direction, the inner plate and the outer plate being located concentrically, a coupling plate including main surfaces facing the axial direction, the coupling plate coupling the inner plate to the outer plate, and at least one flange plate portion including main surfaces facing the axial direction, the at least one flange plate portion projecting in the radial direction from at least one of an end of the inner plate in the axial direction or an end of the outer plate in the axial direction; and an inner plate including a first pin hole of the pin holes (21a, 21b) and main surfaces facing the radial direction, an outer plate including a second pin hole of the pin holes (21a, 21b) and main surfaces facing the radial direction, the inner plate and the outer plate being located concentrically, a coupling plate including main surfaces facing the axial direction, the coupling plate coupling the inner plate to the outer plate, and at least one flange plate portion including main surfaces facing the axial direction, the at least one flange plate portion projecting in the radial direction from at least one of an end of the inner plate in the axial direction or an end of the outer plate in the axial direction; and the at least one flange plate portion comprising a pair of inner flange plates projecting inward in the radial direction from both ends of the inner plate in the axial direction.