Abstract: A retractable caster assembly includes a mounting unit and a foot unit. The mounting unit has a horizontal mounting plate and a hollow connector which projects downwardly from the mounting plate and which is formed with an outward stop projection and a slot immediately below the stop projection. The foot unit has a foot portion, a connecting shaft extending upwardly from the foot portion into an open lower end of the hollow connector, and a horizontal retaining plate extending from one side of the connecting shaft. The foot unit is mounted slidably to the hollow connector and is movable between a first position, wherein the retaining plate extends out of the slot of the hollow connector, and a second position, wherein the retaining plate is retracted into the hollow connector.