for measuring the liquid level of the washing liquid supplied into the casing 1 this washing device comprises a flow control valve 17 for controlling the flow of washing liquid supplied from the liquid supply channel 12 a flow control valve 18 for controlling the flow of washing liquid discharged from the liquid discharge channel 14 an interface component 19 that is operated by the user and a controller 20 that controls the opening and closing of the flow control valves 17 and 18 and designates the valve opening position the liquid level measurement pipe 15 here is configured to be connected to the casing 1 at a position that is lower than the center axis of the laundry tub 2 and to be bent in the vertical direction with this liquid level measurement pipe 15 at an end that is opposite to a connection side to the casing 1 the pressure sensor 16 which measures the pressure inside the liquid level measurement pipe 15 is installed at a position that is higher than the highest point of the laundry tub 2 in the vertical direction part of the washing liquid supplied into the casing 1 flows into the liquid level measurement pipe 15 in which the pressure sensor 16 has thus been installed and the liquid level of this washing liquid in the vertical direction becomes a height position that is the same as the liquid level of the washing liquid inside the casing 1 the pressure sensor 16 then measures the air pressure inside the liquid level measurement pipe 15 and thereby measures the liquid level of the washing liquid inside the liquid level measurement pipe 15 which means that the.