Abstract: A washing machine includes: a vertical axis type washing tub in which laundry and a washing liquid are housed and a washing operation including a wash step is performed; and a roller rotatably provided in an inner wall portion of the washing tub in a state that a rotation axis is vertically oriented, the roller being rotated to facilitate movement of laundry, wherein a water level of the washing liquid in the washing tub is settable in a plurality of levels ranging from a minimum water level to a maximum water level, and the roller is disposed such that an entire vertical length extends over two or more water levels among the plurality of set water levels.