NOVELTY - Ion conductor contains ion conductive compound and electrolyte salt. Ion conductive compound is composed of amorphous fluorine containing polyether compound having fluorine containing group in side chain, an electrolyte soluble unit or a cross-linked product.    USE - As polyelectrolyte (claimed) of lithium secondary battery, capacitor and solar cell.    ADVANTAGE - The ion conductor has high ionic conductivity even around room temperature, low viscosity, incombustibility and excellent oxidation resistance, mechanical strength and heat stability.    DETAILED DESCRIPTION - Ion conductor contains ion conductive compound and electrolyte salt. Ion conductive compound (A-(D)-B) is composed of amorphous fluorine containing polyether compound having fluorine containing group in side chain, while containing an electrolyte soluble unit or a cross-linked product.    D=group of formula: -(D1)n-(FAE)m-(AE)p-(Y)q-;    D1=ether group (-(CH(-(R1)-Rf)-CH2-O)-) (2a) having fluoroether group in side chain;    Rf=fluoroether group;    R1=group optionally having cross-linkable group in principal chain, or bonds with Rf;    FAE=ether unit (-(CH(-(R1)-Rfa)-CH2-O)-) having fluorine-containing alkyl group in side chain (2b);    Rfa=fluorine containing alkyl group;    AE=ether unit (-(CH(-(R1)-R)-CH2-O)-) (2c);    R=H, alkyl, aromatic hydrocarbon or aliphatic cyclic hydrocarbon group, all optionally having cross-linkable functional group;    Y=group -(C(O)-O)- (2d-1), group of formula (2d-2) or (2d-3);    n,m=0-200;    p=0-10000;    q=1-100;    A,B=H, alkyl optionally having fluorine atom and/or cross-linkable functional group, phenyl optionally containing fluorine atom and/or cross-linkable group, -COOH group, -OR2 or ester or carbonate group;and    R2=H or alkyl group optionally containing fluorine atom and/or cross-linkable functional group.    When terminal of groups (2d-1 to 2d-3) is oxygen atom, the groups are not -COOH group, -OR2, ester and carbonate group. An INDEPENDENT CLAIM is included for polyelectrolyte, which contains ion conductor.