Chief Justice of Madras High Court S K Kaul administered the oath of office to Rao.
Chief Minister Jayalalithaa attended the swearing-in ceremony. Family members of Rao including his wife Ch Vinoda were also present.
Lok Sabha Deputy Speaker M Thambidurai, Tamil Nadu Assembly Speaker P Dhanapal, state cabinet ministers, BJP state chief Tamizhisai Sounderrajan and senior party leader La Ganesan were among those who attended the swearing-in ceremony.
Earlier in the day, Rao was received at the airport by Jayalalithaa and others upon his arrival.
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