The invention relates to a hand knob used as a switch, and belongs to the technical field of lock structures. The hand knob is characterized by comprising a hand knob fixing seat and a hand knob sleeve which are arranged on a hand knob installation plate, wherein the hand knob sleeve is arranged at the periphery of the hand knob fixing seat; one side of the hand knob fixing seat is movably connected with a hand knob body; the hand knob body comprises a hand knob control end and a hand knob connection end; on the other side of the hand knob fixing seat, a hand knob lining plate and a hand knob limiting plate are fastened to a connecting shaft of the hand knob fixing seat through fastening nuts; the hand knob lining plate is positioned between the hand knob limiting plate and the hand knob fixing seat; the opposite inner sides of the hand knob lining plate and the hand knob limiting plate are provided with an upper lining plate bump and a lower limiting plate bump respectively; a spring body of a torsional spring is sleeved on the connecting shaft of the hand knob fixing seat; and two positioning spring pins of the torsional spring are clamped and leaned against and connected with the lower limiting plate bump and the upper lining plate bump simultaneously. The hand knob has a reasonable structural design, is concealedly arranged in the hand knob sleeve, is not pulled out and also can be pulled out when used, effectively overcomes the defects of the conventional hand knob, is safer and more attractive when combined with a cabinet body or a door body, is more safely and reliably used, is matched with a lock cylinder, and is suitable for any occasion which needs the switch.