leaders L K Advani and Murli Manohar Joshi were present on the dais with other alliance leaders.
Shah proposed Modi's name and former party presidents Rajnath Singh and Nitin Gadkari seconded the proposal.
Modi's election was a mere formality as the NDA had already declared him the alliance's prime ministerial candidate.
He has led the NDA to a landslide win in the general election, with the BJP
winning 303 seats, its highest ever, and its allies 50.