To provide a pneumatic control valve including: a valve body 10; a valve opening/closing mechanism section 20; a pneumatic control section 60 for the valve opening/closing mechanism 20 that is coupled to the valve element 21 via a piston stem 62; a diaphragm 30 that defines a partition between a fluid and the pneumatic control section 60; a cylindrical lower stopper 40 that is fixed to the valve body 10 as anti-falling off for the valve element 21 and the diaphragm 30 inserted into a valve chamber 13, and supports movement of the piston stem 62; and a cylindrical upper stopper 50 that is fixed to the valve body 10 as anti-falling off for the piston stem 62 inserted into a piston chamber 15, and supports movement of the piston stem 62.