NOVELTY - Polymer having structural unit (I) is new.    USE - New polymer is used for coating liquid for manufacturing electronic device e.g. electroluminescence element, organic electroluminescent element, photoelectric conversion element and transistor (all claimed). Uses include but are not limited to mobile telephone, display of television, backlight of plane light-emitting components, flat panel display of wall-mounted television, copier, printer, liquid crystal display, measuring instruments, display board and marker lamp etc.    ADVANTAGE - The organic electroluminescent element using the polymer has excellent durability and luminous efficiency.    DETAILED DESCRIPTION - Polymer having structural unit of formula: -(Pa-Lb)- (I) is new.    P=group of formula (i);    a=2-5;    A=N or CR;    X=single bond, O, S, C(R)2 or NR;    R=H, 1-20C alkyl, 3-10C cycloalkyl, 6-30C aryl, 3-30C heteroaryl, arylamino group or aryl silyl (all optionally substituted) or single bond for bonding with other P or L, in which at least one of R is of formula (iii)-(vii);    R1-R13=halo, nitro, cyano, hydroxyl, 1-20C alkyl, 3-10C cycloalkyl, 6-30C aryl, 1-20C alkoxy, 3-10C cyclo alkoxy, 6-30C aryloxy, 7-40C aralkyl, 3-30C heteroaryl, alkylamino or arylamino (all optionally substituted), or silyl substituted by alkyl or aryl;    a,c,d,f,g,i=0-4;    b,e,h,j=0-3;    T1-T5=single bond or optionally substituted 6-50C arylene;    b=0-5;and    L=coupling group (when b is 2 or more) or single bond (when b is 0).    L is bonded with carbazole residue at 9-position, 3-position or 2-position. INDEPENDENT CLAIMS are included for the following:    (1) coating liquid, which contains the polymer and solvent;    (2) manufacture of electronic device, which involves forming a film by wet coating using coating liquid; and    (3) organic electroluminescent element, which has one or more organic thin film layers having an anode, a cathode and light-emitting layer between the anode and cathode, in which at least 1 layer of the organic thin film layer contains the polymer.