NOVELTY - An aromatic-amine derivative is new. A deuterium atom is contained in the hydrogen atom contained in the aromatic-amine derivative.    USE - New aromatic-amine derivative is used for hole injection transport materials, materials of organic electroluminescent elements materials, and materials of organic devices (all claimed) e.g. organic thin film transistors, organic solar cells, and image sensors. Uses include but are not limited to LCDs and backlights of flat panel displays of wall-mounted televisions, copiers, printers, measuring instruments, display boards, and marker lamps, and general or special illuminating devices.    ADVANTAGE - The new aromatic-amine derivative has excellent heat resistance, high solubility in solvent, and high hole mobility suitable as positive hole pouring transportation material, and is amorphous. The derivative economically provides organic electroluminescent elements having excellent durability and luminous efficiency.    DETAILED DESCRIPTION - An aromatic-amine derivative of formula: (Z-)n-L, is new. A deuterium atom is contained in the hydrogen atom contained in the aromatic-amine derivative.    Z=(A1)p-Ar1-N(-Ar2-(A2)q)-Ar3-;    L=optionally substituted n-valent coupling group;    n=2-10;    Ar1=(1+p)-valent optionally substituted aromatic hydrocarbyl having 6-25 ring-forming carbon atoms, or (1+p)-valent optionally substituted aromatic heterocyclyl having 5-25 ring-forming atoms;    Ar2=(1+q)-valent optionally substituted aromatic hydrocarbyl having 6-25 ring-forming carbon atoms, or (1+q)-valent optionally substituted aromatic heterocyclyl having 5-25 ring-forming atoms;    Ar3=single bond, optionally substituted bivalent aromatic hydrocarbyl having 6-25 ring-forming carbon atoms, or optionally substituted bivalent aromatic heterocyclyl having 5-25 ring-forming atoms;    A1,A2=monovalent group of formula (i);    p,q=0 or 1;    p+q=1 or more;    X=-O-, -S-, -N- or -N(Ra)-;    Ra=H, 1-15C linear or branched alkyl, 2-15C linear or branched alkenyl, 3-15C cycloalkyl, trialkylsilyl having 1-15C alkyl group, triarylsilyl having aryl with 6-25 ring-forming carbon atoms, alkylarylsilyl having 1-15C alkyl group, aryl having 6-25 ring-forming carbon atoms, aryl having 6-25 ring-forming carbon atoms, or heteroaryl having 5-25 ring-forming atoms;    R1,R2=1-15C linear or branched alkyl, 2-15C linear or branched alkenyl, 3-15C cycloalkyl, trialkylsilyl having 1-15C alkyl, triarylsilyl having aryl with 6-25 ring-forming carbon atoms, alkylarylsilyl having 1-15C alkyl and aryl with 6-25 ring-forming carbon atoms, aryl with 6-25 ring-forming carbon atoms, heteroaryl with 5-25 ring-forming atoms, halo, or cyano;    adjacent R1 groups, adjacent R2 groups, or adjacent R1+R2=(un)saturated ring;    a,b=0-3;    Q1,Q2=(un)saturated having 5-25 ring-forming atoms;and    m=0-2.    (i) When X is -N-, X is nitrogen atom, and is coupled with Ar1 or Ar2; (ii) When (A1)p-Ar1- is of formula (i) and q is 1, X of A2 is -O-, -S-, or -N(Ra)-; and (iii) When (A1)p-Ar1- is of formula (i) and q is 0, Ar2 is optionally substituted aromatic hydrocarbyl having 9-25 ring-forming carbon atoms and polycyclic structure, and is group asymmetrical with respect to bond axis of nitrogen atom coupled with Ar2. An INDEPENDENT CLAIM is included for organic electroluminescent element consisting of organic thin film layer(s) containing a light-emitting layer, clamped between a cathode and an anode. At least organic thin film layer contains the aromatic-amine derivative.