The oath was administered by Delhi High Court's Chief Justice G. Rohini.
Anil Baijal took oath as new Lieutenant Governor of Delhi on 31 December 2016.
Baijal, a 1969-batch Indian Administrative Service officer, retired from service in 2006.
On previous Lieutenant Governor Najeeb Jung's tussle with the Delhi government, he said, "This is speculative".
"Delhi is a megapolis city which has several problems like women safety, law and order, huge population, infrastructure, civic agencies and congestion".
"As we step into the New Year, let us resolve to work together towards building a united and prosperous India", the former top bureaucrat said. "We will sit and talk and you will come to know whether relations have improved or not".
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Chief Minister Arvind Kejriwal, National Security Adviser Ajit Doval, Deputy Chief Minister Manish Sisodia and New Delhi MP Meenakshi Lekhi attended the oath-taking ceremony.
Presently, Baijal is associated with the Vivekananda International Foundation.
Anil Baijal becomes the 21 Lieutenant Governor of Delhi by succeeding Najeeb Jung, who announced his resignation from the post citing that he wanted to return to his first love, academics.
"During the last few months, many of Delhi's works were stopped".
Kejriwal and Jung were at loggerheads ever since the Aam Aadmi Party swept to power in the national capital in February 2015.