NOVELTY - A charge transport film (14) contains cross-linked polymer having dielectric constant of 3.3-6.3 at 25 degrees C with frequency of 100 Hz and alternating voltage of 250 mV when measured using a device. The ethyl-benzoate solution containing hole transportable polymeric compound having diamine repeating unit (I), and 4-isopropyl-4'-methyl-diphenyl iodonium tetrakis (pentafluoro phenyl) borate is formed into film on indium-tin oxide film and baked, to form anode in measurement device. The sample layer containing cross-linked polymer is formed on anode.    USE - Charge transport film for organic electroluminescent element used in organic electroluminescent display (both claimed), photoreceptor, photoelectric transducer, organic solar cell and organic rectifier.    ADVANTAGE - The charge transport film has high transport ability of electric charge, excellent withstand voltage and electric current property. The organic electroluminescent element has excellent durability.    DETAILED DESCRIPTION - A charge transport film contains cross-linked polymer having dielectric constant of 3.3-6.3 at 25 degrees C with frequency of 100 Hz and alternating voltage of 250 mV when measured using a device. The ethyl-benzoate solution containing hole transportable polymeric compound (2 weight%) having diamine repeating unit of formula (I) having weight average molecular weight of 10000-50000 and molecular weight distribution of 1-3, and 4-isopropyl-4'-methyl-diphenyl iodonium tetrakis (pentafluoro phenyl) borate (0.8 weight%) is formed into film having thickness of 30 nm on indium-tin oxide film having thickness of 100-200 nm and baked at 230 degrees C for 3 hours in atmosphere, to form anode in the measurement device. The sample layer containing cross-linked polymer and having thickness of 100-200 nm is formed on the anode. The cathode of the measurement device has a sample layer containing aluminum and thickness of 80 nm. An INDEPENDENT CLAIM is included for the cross-link polymer, which is in the charge transport film.    DESCRIPTION OF DRAWING(S) - The drawings show schematic view of organic electroluminescent element. (Drawing includes non-English language text)    Organic electroluminescent element (10)    Substrate (11)    Anode (12)    Positive hole injection layer (13)    Charge transport film (14)