Patent ID: 7405326

Claim:
An aromatic amine derivative represented by the following general formula (1): wherein Ar 1 to Ar 4 each independently represents a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 30 ring carbon atoms; L 1 represents a single bond; L 2 represents a single bond, a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 5 to 30 ring carbon atoms; when both L 1 and L 2 are single bonds, however, a case where both Ar 1 and Ar 3 each represents a substituted or unsubstituted phenyl group and further, where both Ar 2 and Ar 4 each represents a substituted or unsubstituted biphenylyl group or a substituted or unsubstituted phenyl group is excluded; R a represents a substituent and when R a exists two or more, they may bond each other to form a ring; and n represents an integer of 0 to 8.