To provide a method for producing a fluororesin film, whereby defects due to deterioration (such as fish-eyes due to gelation) of a melt-processable fluororesin are less likely to occur during the production. A method for producing a fluororesin film, which comprises extruding a fluororesin material containing a melt-processable fluororesin through an extruder die, wherein the temperature of the extruder die is from 305 to 355 C., and the average flow velocity v.sub.0.95 of the fluororesin material as obtained by v.sub.0.95=Q.sub.0.95/A.sub.0.95, is at least 110.sup.4 m/sec. Here, when the distance from the flow inlet 22 of the extruder die to the end of the manifold 24 of the extruder die is set to be x=1, Q.sub.0.95 is the flow rate (m.sup.3/sec) of the fluororesin material flowing in the manifold 24 at a position of x=0.95 from the flow inlet 22, and A.sub.0.95 is the cross-sectional area (m.sup.2) of the manifold 24 at a position of x=0.95 from the flow inlet 22.

A conveyance portion, a barrier portion, and a path are provided at places of a portion of a screw main body in which a kneading portion is provided. In at least one of the places, an entrance is opened to cause raw materials, conveyance of which is limited by a barrier portion to increase pressure on the raw materials, to flow in. The raw materials flowing in from the entrance flow through the path in the opposite direction to a conveyance direction of the conveyance portion. An exit is opened in an outer circumferential surface of the screw main body at a position outside the conveyance portion in which the entrance is opened.