NOVELTY - The method for producing nanofibers made of polymeric substances and highly porous polymeric web, comprises supplying a polymer solution (2), which is prepared by dissolving a polymeric substance in a solvent into a rotating cylindrical container (1) having small holes (4), rotating the container, and applying an electric field to filaments of the polymer solution discharged from the small holes and allowing them to be drawn by a centrifugal force and an electrostatic explosion associated with an evaporation of the solvent to produce nanofibers made of the polymeric substance.    USE - The method is useful for producing nanofibers (claimed) made of polymeric substances and highly porous polymeric web, which is useful as a filter, a separator in a battery, and a polyelectrolyte membrane or an electrode used in a fuel cell.    ADVANTAGE - The method ensures uniform production of nanofibers in a simple and a cost effective manner.    DETAILED DESCRIPTION - The method for producing nanofibers made of polymeric substances and highly porous polymeric web, comprises supplying a polymer solution (2), which is prepared by dissolving a polymeric substance in a solvent into a rotating cylindrical container (1) having small holes (4), rotating the container, and applying an electric field to filaments of the polymer solution discharged from the small holes and allowing them to be drawn by a centrifugal force and an electrostatic explosion associated with an evaporation of the solvent to produce nanofibers made of the polymeric substance, and controlling an amount of the polymer solution contained in the rotating container to be constant. A portion of the rotating container in the vicinity of the small holes possesses conductivity. The cylindrical container is provided with the small holes on a circumferential surface and rotates about an axis. INDEPENDENT CLAIMS are included for:    (1) a method for producing a polymeric web; and    (2) an apparatus for producing nanofibers or a polymeric web.    DESCRIPTION OF DRAWING(S) - The diagram shows the method for producing nanofibers.    Rotating cylindrical container (1)    Polymer solution (2)    Small holes (4)    Polymeric filaments (5)    Primary electrostatic explosion. (6)