He Constituent Assembly of Bangladesh was established in 10 April 1972 after the Bangladesh Liberation War to prepare a democratic constitution and served as its first Parliament as an independent nation. The Assembly approved the Constitution on November 4, 1972, and it took effect on December 16[4] and the Constituent Assembly became the Provisional Parliament of Bangladesh until the first elections under the new Constitution took place in 1973.
Until 10 July 1981 the Constituent Assembly, the first and second Parliament held their sittings in the building that now houses the Prime Minister's Office and which is often referred as the old Sangsad Bhaban (old Parliament House). The opening ceremony of the present Parliament House was performed on 15 February 1982. The last session of the second Parliament was held in the new house on 15 February 1982.