Nitish Kumar and his deputy - RJD's Tejashwi Yadav - took oath on August 10.
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A total of 31 ministers were inducted into the cabinet today from various parties that are part of Mahagathbandhan or the Grand Alliance, including the Congress.
The RJD got about 16 ministerial berths, followed by the Janata Dal (United) which kept 11.
Nitish Kumar retained most of the ministers from his party, including Ashok Choudhary, Leshi Singh, Vijay Kumar Chaudhary, Sanjay Jha, Madan Sahni and Bijendra Yadav.
From RJD, Tej Pratap Yadav, Alok Mehta, Surendra Prasad Yadav and Ramanand Yadav, Kumar Sarvajeet and Lalit Yadav took oath as cabinet ministers.
From Congress, Afaque Alam and Murari Lal Gautam will be inducted into the cabinet as ministers, while Hindustani Awam Morcha's Santosh Suman was also sworn in.
The Bihar cabinet can have up to 36 ministers, including the Chief Minister. Some ministerial berths will be kept vacant for future cabinet expansion, sources said.
Nitish Kumar had broken away from the BJP and formed a government with the RJD and other parties earlier this month. The Chief Minister and his deputy - RJD's Tejashwi Yadav - took oath on August 10.
Sources said he felt that the BJP was attempting a repeat of the Maharashtra model - where the Uddhav Thackeray government was dismantled with the rebellion by senior Shiv Sena leader Eknath Shinde who is now the Chief Minister.
The Bihar Grand Alliance has a combined strength of 163. Its effective strength climbed to 164 after Independent MLA Sumit Kumar Singh extended its support to Nitish Kumar.
The new government is likely to prove majority in the Bihar assembly on August 24.
