Abstract: A control valve for a sphygmomanometer comprising a valve housing having at one end a communication opening adapted for communication with an arm cuff and at its other end an air supply opening adapted for communication with an elastic bulb for supplying air to the arm cuff. The housing has an air passage connecting the two openings. A tubular body is mounted on the casing to project radially therefrom and the body is connected at its bottom portion through a communication opening to the air passage intermediate the ends thereof. The outer end of the body is open to the atmosphere. A first valve of tubular shape is arranged to open and close an open end of the tubular body and a second valve of rod shape is loosely mounted in an air passage in the first valve and has an outer end projecting externally from the tubular body. The inner end portion of the second valve serves to open and close an open end of the air passage in the first valve.