After being sworn in for the fifth consecutive time, he was on his way to break the late Communist patriarch Jyoti Basu's record of being India's longest serving chief minister.
Basu had ruled West Bengal for 23 years from 1977 till 2000.
Chamling retained key portfolios like Home and Finance.
R B Subba was allotted sports and youth welfare, law and parliamentary affairs and D T Lepcha transport.
Somnath Poudyal would be in-charge of agriculture while Ugen Gyasto Bhutia was given tourism and the ministry of commerce and industry.
