NOVELTY - Arylsulfonic acid compound (1 or 2) is new.    USE - For electron accepting substance of charge transporting varnish used for charge transporting thin film of organic electroluminescent element (all claimed). The charge transporting varnish is used for capacitor electrode protective film, antistatic film, ionic conduction film, solar cell and fuel cell.    ADVANTAGE - The electroluminescent device having charge transporting thin film containing arylsulfonic acid as electron accepting substance has low driving voltage, high luminous efficiency and long life. Since the arylsulfonic acid compound has high solubility in various organic solvents, noncrystalline-solid thin film is easily produced using the charge transporting varnish which contains the compound as dopant. The current efficiency of light emission is improved and uniform light emission surface is obtained. Since the compound is used with organic solvent only, element degradation by moisture content mixing is prevented.    DETAILED DESCRIPTION - Arylsulfonic acid compound of formula (1) or (2) is new.    X=oxygen, sulfur or NH;    A=naphthalene ring or anthracene ring optionally having substituent other than X and n number of sulfonic acid group;    B=optionally substituted hydrocarbon, 1,3,5-triazine group or optionally substituted group of formula (3) or (4);    W1,W2=O, S, S(O), S(O2) or optionally substituted nitrogen, silicon, phosphorus, or P(O) group;    n=number of sulfonic acid groups attached to A and is ranging from 1-4;    q=number of bonds between B and X and is less than or equal to1;and    r=number of repeated units and is less than or equal to1.    INDEPENDENT CLAIMS are included for the following:    (1) electron-accepting substance which consists of aryl sulfonic-acid compound;    (2) charge transporting varnish which contains electron accepting substance, charge transporting substance and solvent;    (3) charge transporting thin film which contains electron accepting substance and charge transporting substance; and    (4) organic electroluminescent element which has the charge transporting thin film.