The "Phra Thinang Aphorn Phimok Prasat" (พระที่นั่งอาภรณ์ภิโมกข์ปราสาท; ) is an open pavilion, built on a platform on the east wall of the Maha Prasat group. The pavilion was built by King Rama IV as a robing pavilion for the king to change his regalia when entering the Maha Prasat premises. The pavilion was also used as the king's royal palanquin mounting platform. The pavilion is considered the epitome of the finest qualities of Thai traditional architecture in proportion, style and detail. A smaller replica of the pavilion was exhibited at the Brussels World Fair in 1958.