NPP's Y. Joykumar also took oath as Deputy Chief Minister.
Biren Singh, a former Congressman who joined the BJP only in October last year, was sworn in as the Chief Minister along with his Council of Ministers.
The BJP, which has won 21 seats, has claimed it has the support of 33 legislators in the 60-member Manipur assembly. It needs 31 for a majority.
The Congress, which won the most seats, 28, could not gather the support of three more legislators to make the 31-seat majority mark. It has accused the BJP of using "money power" to form government in Goa and Manipur.
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