Abstract: The present invention relates to a hair straightener (10) comprising:—a first jaw (12) having a first plate (16);—a second jaw (14) having a second plate (18);—a hinge (20) coupled to the first and second jaw (12, 14) to permit a user to swivel at least one of the jaws (12, 14) around a hinge axis (22) between an open and a closed position;—a heater for heating at least one of the first and the second plate (16, 18); and—an operating lever (26) to regulate a clamping pressure between the first jaw (12) and the second jaw (14), the operating lever (26) being coupled to the first jaw (12) via a first spring element (28) and pivoted to permit the user to swivel the operating lever (26) relative to the first jaw (12) around the hinge axis (22) or around an axis parallel thereto.