West Bengal Chief Minister Mamata Banerjee was on Thursday administered the oath as a member of the state assembly by Governor Jagdeep Dhankhar.
Banerjee, who won the Bhabanipur by-poll by a margin of 58,835 votes, a record for the seat, took the oath in Bengali.
She needed to win the election to retain the chief minister's chair after her defeat at the hands of protege-turned-rival BJP's Suvendu Adhikari in the March-April assembly elections.
Two other newly elected TMC legislators Jakir Hossain and Amirul Islam also took oath soon afterwards.
Jakir Hossain was declared victorious by a huge margin of 92,480 votes from Jangipur, Amirul Islam won from Samserganj by 26,379 votes.
Dhankhar had on Tuesday said he will administer the oath to Banerjee and others, in a departure from the practice of the governor authorising the speaker of the assembly to conduct the exercise.
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