A pressure release valve including a holder element provided on the outside of the lid of a pressure cooker, a body packing disposed inside the holder element, a pressure release tube provided in the lower inside portion of the body packing, a valve plunger disposed in the body packing and comprising a shank portion and a beveled portion which is at the lower end of the shank portion and set on the upper end of the pressure release tube so as to allow the interior of the pressure release tube to be an empty space, a coil spring mounted on the valve plunger, a lock nut connected to the holder element, and a filtering cap provided fixedly or non-fixedly within the lock nut.