Washing machine

A washing machine comprising:

• a tub configured to receive water;
• a drum rotatably disposed inside the tub and configured to accommodate laundry therein;
• and
• a detergent supply device configured to supply detergent to the tub,
• wherein the detergent supply device comprises:
• a plurality of cartridges that are configured to contain detergent,
• a pump configured to extract the detergent from the plurality of cartridges, and
• a passage switching valve configured to selectively provide fluid communication between the pump and one of the plurality of cartridges,
• wherein the passage switching valve comprises:
• an upper housing that provides a pump connecting portion protruding upward and connected to the pump and that is connected to a water supply pipe, the water supply pipe provided at the detergent supply device and configured to supply water into the upper housing,
• a lower housing connected to the upper housing, providing a space between the upper housing and the lower housing, and including a passage outlet opening located below the space, the space and the passage outlet configured to receive the water supplied to the upper housing by the water supply pipe,
• a disc disposed between the upper housing and the lower housing and including a plurality of disc holes that are spaced apart from each other along a circumferential direction of the disc, the plurality of disc holes facing the space between the upper housing and the lower housing,
• a plurality of passage holes defined at the lower housing, facing the space between the upper housing and the lower housing, and defined below the plurality of disc holes, and
• a plurality of spring valves disposed in the space between the upper housing and the lower housing, configured to open or close at least one of the plurality of passage holes, coupled to the plurality of disc holes, and extending from the plurality of disc holes to the plurality of passage holes.