A washing machine includes a cabinet, a drum inside the cabinet and having a washing chamber formed therein, and a detergent supply device configured to supply a detergent to the washing chamber, the detergent supply device including a detergent container having a detergent accommodation space formed therein to accommodate the detergent to be supplied; and a detergent pump detachably coupled to the detergent container, the detergent pump to pump a detergent accommodated in the detergent accommodation space, the detergent pump including a detecting member to detect an amount of the detergent accommodated in the detergent accommodation space, the detecting member extending forward to be inserted into the detergent accommodation space.