Disclosed are a robot cleaner, a refrigerator, a container transfer system, and a method of transferring and retrieving a container using the robot cleaner. The method of transferring a container include returning a robot cleaner to a position guide device installed at a refrigerator, mounting the robot cleaner on the position guide device, transferring, by the refrigerator, a container built in the refrigerator to mount the container on the robot cleaner, and moving the robot cleaner on which the container is mounted to a target position.