Janata Dal-United (JD-U) leader Nitish Kumar, who led the Grand Alliance to victory in the assembly elections, took oath as the chief minister of Bihar for the fifth time.
Overseen by Governor Ram Nath Kovind, Nitish Kumar took the oath of office and secrecy in the name of God in Hindi at the sprawling Gandhi Maidan.
Rashtriya Janata Dal (RJD) leader Lalu Prasad's sons Tejaswi Yadav and Tej Pratap Yadav then took oath as ministers.
The event was attended by a galaxy of opposition leaders from across the country, including chief ministers of half-a-dozen states and former prime minister H.D. Deve Gowda.
Representing Prime Minister Narendra Modi on the dais at the event was central minister M. Venkaiah Naidu.
The ceremony attended by nine chief ministers, Congress vice president Rahul Gandhi, Nationalist Congress Party president Sharad Pawar, former prime minister H.D. Deve Gowda and leaders of several other political parties.