Washing machine

The present invention includes a drum (3) provided inside a water tank (2), a motor (7) that drives the drum (3), a water supply valve (9) that supplies washing water inside the water tank (2), a water discharge valve (13) that discharges the washing water, a heater (19) that heats the water inside the water tank (2), and a control unit (22) that controls a washing operation. The control unit (22)controls a tank washing operation in which washing of the water tank (2) and the drum (3) is performed, the tank washing operation comprising a disinfecting step for using the heater (19) to heat thewater inside the water tank (2) and disinfecting the interior of the tank (2) using generated steam, a washing step for washing the interior of the water tank (2) after the disinfecting step, and a water discharge step for discharging the water inside the water tank (2). This suppresses the occurrence of discoloration and bad odors due to adhesion of bacteria and mold to clothes during succeedingwashings. 本发明的洗衣机包括：滚筒(3)，