The first of seven phases, Friday's vote covered 166 million voters in 102 constituencies across 21 states and territories
Speaker Shirin Sharmin Chaudhary swore Zahidur into parliament at her office at 12 pm in a ceremony moderated by Parliament Secretary Zafar Ahmed Khan.
Of the 300 candidates elected to the 11th parliament, 295 have now been sworn in, the Parliament Secretariat said. Five BNP MPs-elect are yet to take their oaths.
Zahidur said that he had contested the parliamentary elections on three other occasions before the Dec 30 polls. He became the first BNP candidate to win the Thakurgaon-3 constituency at the 11th parliamentary elections.