To provide a stowing device, cab, and working machine, that may hardly make an operation cabin dirty by something stored such as outdoor shoes and prevent something stored from being made dirty or lost. A stowing device is disposed accessibly from behind an operator's seat in an operation cabin on an inside of a cab comprising an entrance at a back part and comprises a stowing part capable of storing something. As it is possible to store outdoor shoes in the stowing part (40) and change into indoor shoes when getting on the operation cabin through the entrance, the operation cabin will be hardly made dirty by the dust attached on the outdoor shoes and others. As something such as outdoor shoes may be stored in the cab, something stored will not get dirty in the rainy weather and be prevented from being lost during work.