Speaker Hiphei said that only one nomination was received for the election and announced that Lalrinawma was the new deputy speaker.
House leader Lal Thanhawla and opposition group leader Vanlalzawma accompanied the newly elected Deputy Speaker to his seat.
Lal Thanhawla said that Lalrinawma was the chairman of the Law Commission during the previous government and contributed a lot to legislation of a large number of laws and also for discarding obsolete acts.
"His knowledge of law would be invaluable for the state legislature," the chief minister said, adding that he and the Congress members would support him in his efforts to maintain the dignity and decorum of the state legislature.
An advocate by profession, Lalrinawma (53) was elected from Aizawl East-I seat in 2008 state assembly polls from where he won again in the Assembly elections held on November 25 this year.