TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Salt: The metal salt is an electrolyte salt chosen from alkali metal salt, quaternary ammonium salt, quaternary phosphonium salt, and/or transition metal salt of proton acid, preferably lithium salt.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The polymer having structural unit (I) is a polymer having repeating unit (II). The polymer having repeating unit (II) is a polymer having structural unit of formula (V) and repeating unit of formula (VI): -(-C(-R14)(-R15)-C(-R16)(-R17)-)-.R100=H or optionally substituted 1-10C hydrocarbon;R200=functional group which can have active halogen atom at terminal, preferably group of formula: -C(-R18)(-R19)-;b=1 or more;R300=halogen or organic group;c=0, or 1 or more;X=copolymer having repeating unit (II);R14-R16=H or 1-10C hydrocarbon;andR17=optionally substituted aryl;andR18,R19=H, halogen, optionally substituted 1-10C hydrocarbon, or bond with other repeating units.R18 and R19 are not bond with other repeating units simultaneously. The polymer having repeating unit of formula (II) is a copolymer having a block chain (a) having repeating unit (II), block chain (b) having repeating unit (VI), and block chain (c) having repeating unit (IV), in the order of b-a-c, or a copolymer having block chain (a) having repeating unit (II), block chain (b) having repeating unit (III), and a repeating unit different from units (II,III), chosen from repeating units of formulae (IV,III'). The different repeating unit couples with blocks (a and/or b). The sum total number-of-moles of the different repeating unit is 5-99% with respect to the total repeating-unit number-of-moles in the copolymer. The number-of-moles of repeating unit (III) is 1-95% with respect to the total repeating-unit number-of-moles in the copolymer. The number-of-moles of repeating unit (II) is 50-95% and the number-of-moles of repeating unit (III) is 50-5%, with respect to the total repeating-unit number-of-moles in the copolymer. The number-of-moles of block (A) consisting of random copolymer containing repeating units (II,III) is 10-80% with respect to the total repeating-unit number-of-moles in the copolymer. The number-of-moles of repeating unit (IV) is 20-90%.R6,R8=as mentioned above;andR95=1-12C alkyl, aryl, alicyclic hydrocarbon, or heterocyclic group.Preferred Units: Repeating unit (III) is chosen from units of formulae (III-I to III-IV).R6,R8=as mentioned above;R90,R91,R94=1-6C alkylene, 6-10C bivalent aromatic hydrocarbon, 3-10C bivalent alicyclic hydrocarbon, or bivalent organic group;p=1-3;R92=H or 1-4C alkyl;andR93=functional group of formula: -R94-COOH, or H.Preferred Composition: The adhesive agent further contains a cross-linking agent. Preferred Properties: Repeating units (II-IV) have a degree of polymerization of 5 or more. 5 mol or more of different repeating units are included. The ratio of the number-of-moles of block chain (a) having repeating unit (II) and the sum total of the number-of-moles of block chain (c) having repeating unit (VI) and the number-of-moles of block chain (b) having repeating unit (IV), is 1:30-30:1. The polymer or copolymer has a number average molecular weight of 5000-1000000. The polymer or copolymer has a micro phase-separation structure. The structure is a network-type micro phase-separation structure. Preferred Definitions:    R13=aryl.    EXAMPLE - Methoxy polyethylene glycol monomethacrylate (in g) (30), 2-hydroxyethyl methacrylate (3.3), and toluene (100) were taken in a flask, and de-aeration processing was carried out after mixing. To the mixed solution, dichlorotris (triphenylphosphine) ruthenium (0.16), di-n-butylamine (0.09), and 2,2-dichloro acetophenone (0.06) were added, heated at 80degreesC, and polymerization was started. After 62 hours, the temperature of the reaction system was cooled to 0degreesC, and polymerization was stopped. The reaction liquid was purified, and metal complex and unreacted monomer were removed. The viscous residue obtained by removal of volatile matter under reduced pressure was dried at 60degreesC for 5 hours, to obtain a random copolymer of methoxy polyethylene glycol monomethacrylate and 2-hydroxyethyl methacrylate having a weight average molecular weight of 69000 and molecular weight distribution of 1.71. An adhesive agent was prepared by mixing the random copolymer, tolylene diisocyanate, and lithium hexafluorophosphate. The adhesive agent had an adhesive strength of 117 MPa as measured by JISK 6850:1990.