NOVELTY - ( alpha )-Substituted vinyl group-containing aromatic compound (I), is new.    USE - New ( alpha )-substituted vinyl group-containing aromatic compound used for manufacturing polymer used in ink for organic device material, hole injection material or hole transport material for organic electroluminescent element (all claimed). Uses included but are not limited to organic thin film transistor, organic solar cell, image sensor, light source, back light of planar light emitting component, flat panel display of wall-mounted television, illumination, copier, printer, measuring instrument, display board, marker lamp and electrophotographic photoreceptor material.    ADVANTAGE - The polymer produced using the aromatic compound provides organic electroluminescent element having high luminous efficiency and improved lifetime. The aromatic compound has low solubility with respect to solvent.    DETAILED DESCRIPTION - ( alpha )-Substituted vinyl group-containing aromatic compound of formula (I), is new.    X=-C(=CH2)-R1;    R1=halo, or 1-10C alkyl, 1-10C alkoxy, 3-10C cycloalkyl, 3-10C cycloalkoxy, 6-40C aryl, 6-40C aryloxy, 5-40C heteoraryl (all optionally substituted), or silicon-containing group;    Ar1,Ar2=6-100C aryl, 5-100C heteroaryl (both optionally substituted), amino group substituted by 7-100C aralkyl, 6-100C aryl and/or 5-100C heteroaryl (all optionally substituted);    Z=single bond, or 1-10C alkylene, 3-10C cycloalkylene, 6-100C arylene, 7-100C alkylene, 7-100C arylimino or 5-100C heteroarylene (all optionally substituted);    m=1-4;and    n=2 or more.    (i) When m is 2 or more, Z is group with valence of m+1 and which couples with Ar1 and Ar2. INDEPENDENT CLAIMS are included for the following:    (1) polymer, which is obtained by polymerizing the aromatic compound;    (2) ink, which contains the polymer;    (3) organic device material, which contains the polymer;    (4) hole injection material or hole transport material, which contains the polymer; and    (5) organic electroluminescent element, which consists of organic thin film layers containing light emitting layer comprising the polymer, provided between cathode and anode.