TWI733072B

A circulating water passage (10) is formed between a circulating water passage cover (14) and a washing and spin-drying tank (7) having a pulsator (8) disposed rotatably in a central bottom portion thereof, and washing liquid that has risen through the circulating water passage (10) from a pump chamber (19) formed at the outer periphery of a blade (18) provided on a lower surface side of the pulsator (8) is discharged from a discharge port (11) toward the inside of the washing and spin-drying tank (7). The total surface area of holes in the pulsator (8) is greater than the minimum cross-sectional area in the flow passage of the circulating water passage (10), and the minimum cross-sectional area in the flow passage of the circulating water passage (10) is smaller than the surface area of the discharge port (11). This configuration enables laundry positioned above the water surface inside the washing and spin-drying tank (7) to be pulled down below the water surface, while applying the washing liquid over a wi