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1. A hole transport material for an organic electroluminescence device, the hole transport material being represented by the following Formula 1:wherein, in Formula 1, X is an aryl group or a heteroaryl group having 6 to 18 carbon atoms, Y is an aromatic ring, a condensed ring, or a heterocycle containing nitrogen having 6 to 18 carbon atoms, Z is O or S, Ar is an aryl group or a heteroaryl group having 6 to 18 carbon atoms, R is an aryl group or a heteroaryl group having 6 to 10 carbon atoms, or an alkyl group having 1 to 12 carbon atoms, and a is an integer of 0 to 3.
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