PURPOSE: To lighten and improve a credibility of an exhaust nozzle provided with a control flap which is tapered and widens toward its end and so forth by constituting each flap so as to open and close freely syncronously through a prescribed link structure by the operation of a jack.

CONSTITUTION: The axis symmetric exhaust nozzle includes an annular structure which is installed at an extended part of an outlet of a fixed passage 1 and the structure is equipped with a plurality of beams 4 which are supported by a cap 3. A tapering flap 16 is installed at a joint point 10 of the beams 4, a flap 22 which is widened toward its end is installed at a joint part 20 provided at a point of a lower stream of the flap 16 and a cold flap 27 is installed at a joint point 12 of the beams 4. And each flaps 10, 22, 27 can change their angles through levers 34, 35 and a rod 42 by shaking a control lever 48 which is supported by a joint point 11 of the beams 4 through an axis 32 by the operation of a jack 13.