NOVELTY - A new high-molecular compound consists of copolymer including unit (B), and unit (A) and/or unit (C), and has weight average molecular weight of 50000-1500000. The unit (A) is unit having principal chain group chosen from optionally substituted aromatic-hydrocarbon group and optionally substituted aromatic heterocyclic group. The unit (B) is a bivalent unit (I) or (II) containing polymeric principal chain. The unit (C) is unit (III)-(V) containing polymeric principal chain.    USE - New high-molecular compound is used for material and coating liquid used for forming electronic device e.g. organic electroluminescent element (all claimed), organic thin-film solar cell and organic thin-film transistor.    ADVANTAGE - The high-molecular compound provides organic electroluminescent element with luminous efficiency.    DETAILED DESCRIPTION - A new high-molecular compound consists of copolymer including unit (B), and unit (A) and/or unit (C), and has weight average molecular weight of 50000-1500000. The unit (A) is unit having principal chain group chosen from optionally substituted aromatic-hydrocarbon group and optionally substituted aromatic heterocyclic group. The unit (B) is a bivalent unit of formula (I) or (II) containing polymeric principal chain. The unit (C) is unit of formula: -(Ar1)n- (III), unit of formula (IV)-(V) containing polymeric principal chain.    L=aryl or heteroaryl having 1 or 2 N (both optionally substituted);    X1-X3,Y1-Y3=single bond, CR12, NR1, O, S or SiR12;    R1,A1=H, or alkyl, cycloalkyl, aryl or heteroaryl (all optionally substituted);    L1=optionally substituted coupling group;    Z1+X1+Y1,Z4+X1+X2,Z2+X1+X2+Y1+Y2, Z3+X1,Z5,Z6=alicyclic hydrocarbyl, aliphatic heterocyclyl, aryl or heteroaryl (all optionally substituted);    Ar1-Ar3=aryl or heteroaryl (both optionally substituted);    l=0-5;and    m,n=1-50.    INDEPENDENT CLAIMS are included for the following:    (1) organic electroluminescent element;    (2) coating liquid, which contains high-molecular compound and solvent; and    (3) manufacture of organic electroluminescent element.