PURPOSE: To easily wash a cup and the like even in a place in which neither a faucet nor a sculley is provided by providing a supply channel to supply water from a housed feed water tank to a washing chamber and a drainage to drain the water from the washing chamber to a housed waste water tank.

CONSTITUTION: A washer body 1 is placed on a table in a room, etc., cups are put over injection nozzle groups 10, dishes are rest against the nozzle groups 10, and a feed water tank 19 and a waste water tank 23 are installed in respective chambers 7 and 8. When the start key of a control panel 3 is operated, a feed electromagnetic valve 15 is opened, and city water flows down in a washing chamber 5. When a pump 6 is rotated forward, the water is jetted from the injection nozzle groups 10 and washes the cups, etc. When washing time presses, the pump 6 is stopped once, and when the pump 6 is continuously rotated backward, washing water in the washing chamber 5 is discharged to the waste water tank 23 by the pump 6. Thus, even in the place in which neither the faucet nor the sculley exists in the neighborhood, the title dish washer can be used with a simple method, and extreme simplicity and satisfactory usefulness can be obtained.