A geyujo is a document that, when an officer in a position is replaced with another person under the Ritsuryo system (a system of centralized government based on the ritsuryo code) in ancient Japan, was issued confirming the change necessary for continuing office duties.
解由状（げゆじょう）は、古代日本の律令制における、官人交替の際の事務引継ぎ文書である。