A method of producing a powder coating material containing a fluororesin and a non-fluororesin, the method comprising: kneading a raw material containing the fluororesin and the non-fluororesin with a kneading extruder equipped with a screw having a transport zone, a kneading zone and a metering zone, the metering zone being provided downstream of the kneading zone, wherein the kneading zone includes a neutral zone equipped with a neutral kneading segment and a non-neutral zone equipped with a non-neutral kneading segment, the neutral segment and the non-neutral segment being provided with a plurality of kneading discs arranged so as to be offset from each other when viewed in a plane orthogonal to the axial direction of the screw, wherein in the neutral segment and the non-neutral segment, the angles at which the adjacent kneading discs are displaced are different, the neutral kneading segment having a high kneading function and almost no transporting function, and the non-neutral kneading segment having a kneading function, but also a transporting function, a ratio of a length L K of the kneading zone to an effective length Ls of the screw (L K /L S × 100) is 21.0 to 50.0%, the length L K of the kneading zone being the total length of all kneading zones when there is a plurality thereof and the effective length L S of the screw being the total length of all the transport zones, the kneading zones, and the metering zones of the screw, a ratio of a length L N of the neutral zone to a length L K of the kneading zone (L N /L K × 100) is 30% or more, and the screw includes a diameter D S, and a value of a ratio of an effective length Ls of the screw to the diameter D S (L S /D S) is 10 or more. kneading a raw material containing the fluororesin and the non-fluororesin with a kneading extruder equipped with a screw having a transport zone, a kneading zone and a metering zone, the metering zone being provided downstream of the kneading zone, wherein the kneading zone includes a neutral zone equipped with a neutral kneading segment and a non-neutral zone equipped with a non-neutral kneading segment, the neutral segment and the non-neutral segment being provided with a plurality of kneading discs arranged so as to be offset from each other when viewed in a plane orthogonal to the axial direction of the screw, wherein in the neutral segment and the non-neutral segment, the angles at which the adjacent kneading discs are displaced are different, the neutral kneading segment having a high kneading function and almost no transporting function, and the non-neutral kneading segment having a kneading the neutral segment and the non-neutral segment being provided with a plurality of kneading discs arranged so as to be offset from each other when viewed in a plane orthogonal to the axial direction of the screw, wherein in the neutral segment and the non-neutral segment, the angles at which the adjacent kneading discs are displaced are different, the neutral kneading segment having a high kneading function and almost no transporting function, and the non-neutral kneading segment having a kneading function, but also a transporting function, a ratio of a length L N of the neutral zone to a length L K of the kneading zone (L N /L K × 100) is 30% or more, and the screw includes a diameter D S, and a value of a ratio of an effective length Ls of the screw to the diameter D S (L S /D S) is 10 or more.