The Istana Besar, is the primary palace of the Yang Di-Pertuan Besar of Negeri Sembilan. It was built and completed in 1932, and officiated by Tuanku Muhammad ibni Almarhum Tuanku Antah who moved there after it was completed. The Istana Besar complex has extensive facilities to support the residence of HRH, The Yang Di-Pertuan Besar. In the main building, there is a grand hall, waiting and audience rooms, residential apartments spread over three floors.
In the adjacent building, there is a throne room (Balairung Seri) where formal ceremonies are held which includes investitures, oath of allegiance / appointment ceremonies and where large congregational prayers are held. The main Banquet Hall, which was constructed almost seventy years later, can house approximately two thousand people. The current Yang Di-Pertuan Besar is HRH Tuanku Muhriz. There are also offices, facilities and general quarters for palace officials and staff.