Washing machine

The invention provides a washing machine which can inform a user of the situation that the amount of a washing treatment agent contained in a washing treatment agent box is reduced in multiple stages.The washing machine is provided with: a detection unit for detecting the amount of a washing treatment agent contained in a treatment agent cartridge; a notification unit for notifying information relating to the amount of the washing treatment agent contained in the treatment agent cartridge; and a control unit configured so as to be capable of performing a washing operation for washing laundryaccommodated in a washing drum. When the amount of the washing treatment agent detected by the detection unit is less than a first threshold value and is equal to or greater than a second threshold value that is less than the first threshold value, the control unit controls the notification unit to notify the notification unit of first notification information relating to the amount of the washingtreatment agent. When the