He was administered the oath of office by AP High Court Chief Justice A Ramesh Dave at a brief function in the Raj Bhavan at 9.30 am.
President Pratibha Patil had yesterday asked Narasimhan, currently the Chattisgarh Governor, to discharge the duties in the Raj Bhavan here till further arrangements were made.
Chief Minister K Rosaiah, his Cabinet colleagues, leaders of opposition parties, former Chief Minister Nadendla Bhaskara Rao and others attended the function.
State Chief Secretary P Ramakanth Reddy read out the warrant of appointment of Narasimhan following which the High Court Chief Justice administered the oath.
A former Indian Police Service officer of the Andhra Pradesh cadre, Narasimhan has also served as chief of the Intelligence Bureau.
Narasimhan arrived here late last night and was received at the Begumpet airport by Rosaiah. Tiwari, who submitted his resignation on Saturday, left for New Delhi around 5.30 am today.
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