Prime Minister Sheikh Hasina administered the oath at a function in the PMO on Thursday.
On the other hand, Local Government, Rural Development and Cooperatives Minister Khandaker Mosharraf Hossain administered the oath to elected 27 general councillors and 9 women councillors of reserved seats.
After the event, the mayor and the councillors took photographs with the premier.
Road Transport and Bridges Minister Obaidul Quader attended the function conducted by Abdul Malek, secretary of the LGRD Ministry.
Cabinet members, advisers to the prime minister, leaders of different political parties and senior government officials were present.
Ivy was elected mayor, for the second time, in the NCC polls held on December 22, 2016 with Awami League ticket defeating BNP-nominated Shakhwat Hossain.