To prevent washing water from overflowing from a tub in a washing process even if water is supplied to a prescribed level due to failure to stop a suction pump when water is supplied to a washing and dehydration tub, manually using a suction pump in a water supply process in a washing machine that sucks remaining bath, wash by circulating washing water in a washing and dehydration tub and rinse.

A washing and dehydration tub 2 rotatably arranged in a water receiving tub 1 is driven by a motor 4, tap water is supplied to the washing and dehydration tub 2 by a feedwater valve 11 and water in the washing and dehydration tub 2 is drained by a drainage valve 5, a water level in the washing and dehydration tub 2 is detected by a water level detection means 16, and washing, rinsing and dehydration processes are sequentially controlled by a control means 17. a connector pipe engagement detection means 18 detecting the engagement of a water suction pump joint pipe 13 is provided in the vicinity of a feedwater pipe section 12 supplying bath water to the washing and dehydration tub 2, and the control means 17 controls operation by output from the connector pipe engagement detection means 18.