Newly-elected lawmakers were sworn in at a formal ceremony held at the parliament secretariat in the capital on Thursday.
Speaker Shirin Sharmin Chowdhury first took the oath as per rules of procedure and put her signature on the letter of oath.
As per custom, lawmakers of the party having majority seats take the oath first.
Jatiya Party chairman HM Ershad, who won the elections in his home constituency of Rangpur-3 and former Public Administration Minister and senior Awami League leader Syed Ashraful Islam, who won from Kishoreganj constituency did not take oath on health ground.
Meanwhile, Bangladesh Nationalist Party-dominated Jatiya Oikya Front (JOF) lawmakers-elect refrained from taking oath after its humiliating defeat in December 30 polls.
The Awami League-led grand alliance secured 288 seats while the JOF led by Dr Kamal Hossain bagged only seven seats, leaving the opposition alliance in tatters in the filed of politics.
The Awami League got 257 seats, Jatiya Party (Ershad) 22, BNP five, Workers Party of Bangladesh three, JSD, Bikalpa Dhara and Gano Forum two each, Jatiya Party (Monju) one seat and independent candidates got three seats.
Parliament secretariat senior secretary Zafar Ahmed Khan conducted the oath- taking ceremony, beginning with recitation from the holy Quran.
Prime Minister Sheikh Hasina wearing a pink and ash coloured Jamdani saree entered the Oath Room at about 11:03am.
The Election Commission on Tuesday published the results of the 11th general elections and issued a gazette notification containing the names and addresses of candidates of 298 constituencies.
The polling was held peacefully amid festivity in 299 out of 300 seats on December 30 as voting in Gaibandha-3 constituency was suspended due to death of a candidate earlier.
However, the results of Brahmanbaria-2 constituency was postponed as voting in three centres of the constituency was suspended.
After taking oath, the lawmakers put signatures on the letter of oath.
As per the law, if any lawmaker-elect refrains from taking oath within 90 days after the beginning of the first session or refrains from informing the Speaker, his/her membership will be cancelled.
There is a constitutional obligation to take oath within three days after the publication of the gazette of the polls results.
BNP secretary general Mirza Fakhrul Islam Alamgir at a briefing on Monday said that they would not take oath as the national election was not held in a free, fair and credible manner.
Replying to a query, Fakhrul, an elected MP from Bogura-6 constituency despite its debacle, has said that his party rejected the total election results.
BNP, which boycotted the 2014 national election, joined the polls under the Jatiya Oikya Front banner and suffered a humiliating defeat.
Raising allegations of massive vote rigging, ballot stuffing and other irregularities, the JOF has demanded reelection.
Chief Election Commissioner KH Nurul Huda brushed aside the demand, terming the election as a credible one.
After the polls debacle, there has been a difference of opinions in BNP whether their elected lawmakers will take oath or not.
BNP joined the polls without its convicted chief Khaleda Zia for the first time since her stepping into the politics in early 1980s.