BJP leader Sushil Kumar Modi was also administered the oath by Governor Keshari Nath Tripathi here.
Kumar resigned as the chief minister last night. The ostensible reason for him to quit was his falling out with the RJD over corruption charges against Lalu Yadav's son Tejashwi who was the then deputy CM.
The JD(U) had walked out of the NDA in July 2013, ending its 17-year-old alliance, after Narendra Modi was nominated head of the BJP's campaign committee for the 2014 Lok Sabha polls.
After the JD(U) walked out of the grand alliance last evening, the BJP readily stepped in to support its former ally. With Sushil Modi taking oath, the BJP comes back to power in the state after four years.
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It is the sixth time Kumar has been sworn in as the chief minisiter of the state.
The JD(U), BJP, their allies and supporting independent MLAs together account for 132 seats in the 243-member Bihar Assembly, 10 more than the magic figure of 122.