TECHNOLOGY FOCUS - POLYMERS - Preferred Electrolyte: The polymer electrolyte has a structure expressed by any one of the following structural formulas (1.1) to (1.4).r, s and t=each are an integer greater than or equal to 0;n=an integer greater than or equal to 1;P=a direct bond, a first perfluorocarbon or a hydrocarbon, and the first perfluorocarbon or the hydrocarbon each may include an ether bond and/or a sulfonyl bond;R and R'=each are fluorine or a second perfluorocarbon having a carbon number of 1-10, the second perfluorocarbon may include an ether bond and/or a sulfonyl bond, and R and R' may be, the same or may be different from each other in a ring structure;X=hydrogen, an alkali metal or a cation that forms a salt with 1,3-disulfoflimide; andQ=a direct bond, oxygen or a third perfluorocarbon having a carbon number of 1-10, and the third perfluorocarbon may include an ether bond and/or a sulfonyl bond.The P has a structure expressed by any one of the following structural formulas (2.1) to (2.6).m=an integer greater than or equal to 1; andR1 -R4=each are fluorine or a fourth perfluorocarbon having a carbon number of 1-10, and the fourth perfluorocarbon may include an ether bond and/or a sulfonyl bond.The P is the hydrocarbon, and the polymer electrolyte is formed of a block copolymer of the P and the fluorine-containing structure having an alicyclic 3,3-disulfonimide. Preferred Monomer: The imide monomer has a structure expressed by any one of the following structural formulas (3.1) to (3.5).R and R'=each are fluorine or a second perfluorocarbon having a carbon number of 1-10, the second perfluorocarbon may include an ether bond and/or a sulfonyl bond, and R and R' may be the same or may be different from each other in a molecule;X=hydrogen, an alkali metal or a cation that. forms a salt with 1,3-disulfonimide;Q=a direct bond, oxygen or a third perfluorocarbon having a carbon number of 1-10, and the third perfluorocarbon may include an ether bond and/or a sulfonyl bond; andR''=hydrogen or a hydrocarbon having a carbon number of 1-10, and R'' may be the same or may be different from each other in the molecule.Preferred Method: In manufacturing the polymer electrolyte, the one or two or more types of imide monomers have a structure expressed by any one of the following structural formulas (3.1) to (3.5). The raw material includes the one or two or more types of imide monomers and one or two or more types of second monomers having a polymerizable functional group, and the polymerization step is a copolymerization step of copolymerizing the one or two or more types of imide monomers and the one or two or more types of second monomers. The one or two or more types of second monomers each have a structure expressed by any one of the following structural formulas (4.1) to (4.6).R1-R4=each are fluorine or a fourth perfluorocarbon having a carbon number of 1-10, and the fourth perfluorocarbon may include an ether bond and/or a sulfonyl bond.The raw material includes the one or two or more types of imide monomers and one or two or more types of fluorocarbon-based polymers or hydrocarbon-based polymers having a polymerizable functional group, and the polymerization step is a block copolymerization step of block copolymerizing the one or two or more types of imide monomers and the one or two or more types of fluorocarbon-based polymers or hydrocarbon-based polymers. EXAMPLE - No suitable example given.