Founders of the library particularly Arbab Keykhosro intended to launch a museum adjacent to the library. They decided to purchase the paintings of Kamal ol-Molk, eminent Iranian painter, and some other artist`s masterpieces in order to exhibit in the museum. Grand master Kamal ol-Molk offered some of his precious paintings to be the pioneer in this regards. Having accumulated other unique works like calligraphy, manuscripts and historical documents.
After Iran Islamic Revolution in 1979, the gifts which have been donated to the Islamic Consultative Assembly by officials of various countries like parliamentary delegations were transformed to the library.
Today the museum exhibits the masterpieces of outstanding Iranian painters and calligraphers like Kamal ol-Molk, Ali Mahmudi, Mahmud Olia and Jafar Chehrenegar. Furthermore, the museum provides a great opportunity for visitors to follow the history of contemporary Iran i.e the history of Constitution, Legislation and Islamic Republic through paintings, photos, statues and documents.
Having transformed the Parliament to the new building, the library administrators intended to dedicate the Constitution Parliament building called Khaneye Mashrute to the new museum. In 2009 the new museum was inaugurated by Dr Larijani the speaker of the Islamic Consultative Assembly.