To provide a pilot valve for a positioner preventing the damage of a diaphragm or the like supporting a spool while facilitating replacement of the pilot valve.

The pilot valve for the positioner comprises a supply air pressure chamber 22 and an output pressure chamber 23 formed on both end sides, wherein the supply air pressure chamber 22 comprises an air supply port 2210, and the output pressure chamber 23 comprises an output port 2301 and communicates with the supply air pressure chamber 22 through an air supply valve seat 25; a pressure chamber 31 communicating with one side of the output pressure chamber; an atmospheric chamber 30 formed to be adjacent to the pressure chamber through the diaphragm 33; a nozzle back pressure chamber 28 formed on the anti-pressure chamber side of the atmospheric chamber through the diaphragm 33 and communicating with one side of the supply air pressure chamber while having a nozzle back pressure lead-in pipe 10 connected thereto; a spool 27 supported by the diaphragm and having an exhaust passage 2701 and an exhaust hole 2702; and a pair of valve elements 24 comprising air supply valves 2401 and exhaust valves 2402 and insert-mounted to close each air supply valve seat with the air supply valve and both end openings of the spool with the exhaust valves.