The Inner Court was a restricted area in ancient times, serving as the private residence of King Narai the Great and the ladies of the court. The most significant structure in this zone is the "Suttha Sawan Throne Hall", which was the King’s private residence and the site of his passing. The surrounding area was once beautifully decorated with flower gardens, ornamental plants, and fountains, influenced by the French architectural styles he admired. The key characteristic of this zone is its tranquility and a layout focused on privacy, with walls and entrances strictly separated from the Middle Court. Today, the remains of building foundations and walls still exist, showcasing the grandeur and lifestyle of the Lopburi royal court from over 300 years ago.