TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The polymeric electrolytic solution is coated on base material, and heated to obtain polymer electrolyte membrane intermediate component on base material. Preferred Composition: The polymeric electrolytic solution contains at least one organic solvent. The ion-conductive polymer has aromatic ring with main chain, ion exchange group directly bonded with aromatic ring or ion exchange group indirectly bonded with other atoms or atom groups. The aromatic ring further has a side chain. The block (A) has ion exchange group and block (B) does not contain ion exchange group. The ion exchange group is sulfonic acid group. The content of organic solvent in polymer electrolyte membrane is 6000 wt.ppm or less with respect to total content of polymer electrolyte membrane. Preferred Properties: The organic solvent has boiling point of 150degrees C or more under pressure of 101.3 kPa. Preferred Substances: The ion-conductive polymer is of formulae (Ia-IVa).Ar1-Ar9=aromatic ring having main chain, bivalent aromatic group having aromatic ring with side chain or ion exchange group directly bonded to aromatic ring having main chain or side chain;Z,Z'=-CO- or -SO2-;X,X',X"=-O- or -S-;Y'=group having direct bond or CH3-C(-Ra)(-Rb)-CH3;p=0-2;andq,r=1-3.Preferred Groups: The ion exchange group is chosen from compound of formulae (Ib-IVb) or (Ib'-IIIb').Ar11-Ar19=bivalent aromatic group optionally having substituent;Z,Z',X,X',X",Y'=same as defined above;p'=1-2;q',r'=1-3;Ra,Rb=1-10C alkyl group, H, 2-2C acyl group optionally having 6-18C aryloxy group, 6-18C aryl group, 1-10C alkoxy group optionally having substituent or substituent;andn=5 or more.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The co-polymerization pattern is copolymer of block-copolymerization of graft polymerization. The ion-conductive polymer has block of formula (IVa') having ion exchange group directly bonded with aromatic ring having main chain as block (A). The polymer electrolyte membrane has micro phase-separation structure. The ion-conductive polymer is hydrocarbon type ion-conductive polymer with halogen atom (15 wt.% or less).Ar9=same as defined above.Preferred Property: The phase density of block (A) has ion exchange group higher or lower than density of block (B) which does not have ion exchange block.