63-year-old Modi, who led BJP to an astounding victory in the Lok Sabha polls, had last week extended an invitation to six heads of state and government of the SAARC grouping to attend his swearing-in as Prime Minister.
Sharif, who is accompanied by a delegation comprising his Advisor on National Security and Foreign Affairs Sartaj Aziz, Special Assistant Tariq Fatemi and Foreign Secretary Aizaz Chaudhry among others, arrived at the technical Air Force base in Palam.
It is the first ever visit by a Pakistan leader to India to attend the oath taking ceremony of a prime minister-designate.
Earlier, Rajapaksa and Mauritius Prime Minister Navin Ramgoolam arrived in the city to attend the ceremony.
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Bhutan Prime Minister Lyonchen Tshering Tobgay and Speaker of Bangladesh Shirin Chaudhry, who is representing her Prime Minister Sheikh Hasina, arrived yesterday for the ceremony. Hasina is travelling to Japan at the time of the swearing-in ceremony.
This is the first time that the heads of state and government of SAARC nations have been invited to attend the swearing-in ceremony of an Indian Prime Minister, a move which is seen by political observers here as a significant initiative.