Rig Majomard Mosque is a type of one-porch mosques whose construction date is 848 AH. It has a courtyard, porch, dome and side naves. In the western part of the mosque, there are tombstones, one of which belongs to the founder of the mosque, Haji Kamal al-Din, and the other is the grave of his son Haji Jamal al-Din Mahmud ibn Haji Kamal al-Din Isa ibn Jalaluddin Mahmud. On the tombstone of Haji Kamal al-Din, the tiles of the mosque and its margins are inscribed with beautiful Naskh script, and also on the tombstone of Haji Jamal al-Din with mosaic tiles and in Naskh script, the blessed names of the twelve Imams on the margins of the surfaces of Ayatollah Al-Kursi and in the middle of the flower. The sentence La ilaha illa Allah and Muhammad, the Messenger of Allah, has been written. In the tomb on the south side of the dome, there are tombs, some of which have old colored tiles. This building belongs to the Timurid period, the ninth century AH and has been registered under number 2403. In this research, an attempt has been made to introduce the building of the historical mosque of Rig Majmourd, belonging to the Timurid period, ninth century AH, and has been registered under number 2403.