A washing machine equipped with a detergent supply device has an improved component coupling structure capable of enhancing productivity. A washing machine includes a main body, a drum rotatably mounted in the main body, and a detergent supply device disposed at an upper portion of the main body to supply a detergent into the drum. The detergent supply device includes a housing, a detergent case to store a detergent, the detergent case being movably coupled to the housing, a water supply frame coupled to an upper portion of the housing to guide water to the detergent case, and a cover frame to sealingly cover an upper portion of the water supply frame, the cover frame including a plurality of coupling protrusions protruding from an inner peripheral surface thereof to support a bottom surface of the water supply frame.