TECHNOLOGY FOCUS - POLYMERS - Preferred Units: The polyelectrolyte comprises a repeating unit (10-95 mol%) derived from a monomer containing COOZ group and SO3Z group, of formula: CF2=CF(CF2)k-Ol-(CF2CFY'1-O)n-(CFY'2)m-A1, and a repeating unit (5-90 mol%) derived from an ethylenically fluoromonomer copolymerizable with monomer having COOZ group or SO3Z group, with the sum total content being 95-100 mol%.Y'1=F, Cl or perfluoroalkyl, preferably F;k=0-2, preferably 0;l=0 or 1, preferably 1;n=0-8, preferably 0;Y'2=F or Cl, preferably F;m=0-6, preferably 2;andA1=COOZ or SO3Z, preferably -SO3H.When m is 0, l is 0 and n is 0. Preferred Properties: The distance (d) between ion clusters at 25 degrees C and 50% relative humidity by small-angle X-ray measurement is 0.1-2.6 nm, as measured by d = ( lambda )/2/sin(( theta )m), where lambda is an incident X-ray wavelength used for small-angle X-ray measurement, and ( theta )m is the Bragg angle which shows a peak. The polyelectrolyte has a melt flow rate of 0.01-100 g/10 minutes. Preferred Process: Chemical processing for providing COOZ or SO3Z group is carried out by immersion in a basic reaction liquid. Emulsion-polymerization is carried out at 0-40 degrees C. EXAMPLE - (In g) water (2980), ammonium carboxylate compound (C7F15COONH4) (60), sulfonylfluoride compound (CF2=CFOCF2CF2SO2F) (943), and tetrafluoroethylene were taken in a container. A solution obtained by dissolving ammonium peroxydisulfate (6) in water (20) was supplied, and polymerization was started. Water (4400) was added to the polymerized liquid (4260), after 408 minutes. Nitric acid was added, and the coagulated polymer was filtered and dried to obtain a polymer (893) having a melt flow rate of 16 g/10 minutes and a sulfonic-acid-group-containing repeating unit (29 mol%). The obtained precursor was contacted with an aqueous solution obtained by dissolving potassium hydroxide (15 mass%) and methyl alcohol (50 mass%) at 80 degrees C for 20 hours, and hydrolysis was carried out. The reaction mixture was immersed in water at 60 degrees C for 5 hours and then in hydrochloric acid aqueous solution, and washed and dried to obtain a fluorine-type polyelectrolyte. An electrolyte membrane obtained using the polyelectrolyte had a conductivity of 0.14 S/cm.