The invention provides a novel silicon-containing compound having an oxidation potential of 0.3 to 1.5 V on the basis of a standard hydrogen electrode, wherein at least one alkoxy group is bonded to a silicon atom and at least one aromatic amine group is also bonded to the silicon atom. An organic electroluminescence device having excellent mechanical and electric contact between an electrode and an organic layer is also provided by treating the surface of an anode with using a surface-treating agent comprising the above silicon-containing compound.