This thesis mainly deals with what is the Gurodae, recorded on the YeonggeonUigwe and the SanleungUigwe. Gurodae makes diverse appearance In Uigwes.(久老代, 仇老代, 求路代, 仇老臺, 仇露臺, 求露臺, 仇累臺, 九累臺) It seems that Gurodae was an architectural member used on the roof. Especially that was a member of the eaves. Gurodae looks like a Pyeonggodae, located on the end of the rafters. But it differs in the shape compare to that of Pyeonggodae. Gurodae has the shape of combined members, Pyeonggodae and Chakgo. Chakgo is a member covering the space, between two Buyeons So Gurodae has the shape of prominence and depression. The result obtained by surveying the Uigwes is the Gurodae used until 1789. After the publication of HyeonlyungwonUigwe in 1789, that member was no longer existed on the other Uigwes. In 1794, the year making Hwaseong fortress, Gurodae divided into two members, Chopyeonggodae and Chakgo. Since then Chopyeonggodae and Chakgo never combined again.