A dishwasher (50, 52) for washing an object to be washed, the dishwasher (50, 52) comprising: an operation unit configured to input an instruction to the dishwasher (50, 52); a control unit (21, 41) configured to carry out an operation control of the dishwasher (50, 52) based on the instruction input by the operation unit; a display unit configured to display an operation status of the dishwasher (50, 52); and a storage unit configured to store information associated with an operation elapsed state, and enabling read and write of the information; wherein the control unit (21, 41) is further configured to perform a display of an inspection notifying that an inspection timing of the dishwasher (50, 52) is reached by the display unit when determined that an operation time greater than or equal to a first predetermined time has elapsed based on the information associated with the operation elapsed state stored in the storage unit; characterized in that: the information associated with the operation elapsed state stored in the storage unit includes an operation flag, which is selectively set from at least two values, in correspondence with whether or not the operation time of the dishwasher (50, 52) has elapsed by greater than or equal to the first predetermined time, and the control unit is further configured to not perform the display of the inspection again, subsequent to the inspection, regardless of an operation elapsed state of the dishwasher (50,52) by setting the value of the operation flag which indicates that the operation time of the dishwasher (50, 52) has elapsed by greater than or equal to the first predetermined time at the time of the inspection. an operation unit configured to input an instruction to the dishwasher (50, 52); a control unit (21, 41) configured to carry out an operation control of the dishwasher (50, 52) based on the instruction input by the operation unit; a display unit configured to display an operation status of the dishwasher (50, 52); and a storage unit configured to store information associated with an operation elapsed state, and enabling read and write of the information; wherein the control unit (21, 41) is further configured to perform a display of an inspection notifying that an inspection timing of the dishwasher (50, 52) is reached by the display unit when determined that an operation time greater than or equal to a first predetermined time has elapsed based on the information associated with the operation elapsed state stored in the storage unit; the information associated with the operation elapsed state stored in the storage unit includes an operation flag, which is selectively set from at least two values, in correspondence with whether or not the operation time of the dishwasher (50, 52) has elapsed by greater than or equal to the first predetermined time, and the control unit is further configured to not perform the display of the inspection again, subsequent to the inspection, regardless of an operation elapsed state of the dishwasher (50,52) by setting the value of the operation flag which indicates that the operation time of the dishwasher (50, 52) has elapsed by greater than or equal to the first predetermined time at the time of the inspection.