DISHWASHER

PROBLEM TO BE SOLVED: To provide a dishwasher that supports a user's sanitary management and at the same time can maintain the washing performance.SOLUTION: In the dishwasher 1 which conducts a washing operation that includes a washing step wherein dishes D are washed with washing water inside a washing tank 9 and a rinsing step wherein the dishes D are rinsed with rinsing water inside a hot-water tank 18, collects the washing water used in the washing step, and reuses the rinsing water used in the rinsing step into the washing tank 9 and for washing water, an alert is output that notifies a user of a changing timing of the washing water in the washing tank 9. With this dishwasher 1, by outputting the alert, the user can change the washing water before the washing water gets dirty and therefore the dishwasher can support the user's sanitary management. Moreover, with this dishwasher 1, by encouraging the user to change the washing water, jamming of a washing nozzle, etc. due to dirt can be prevented, resulting in maintaining the washing performance of the dishwasher 1.