A washing machine having a detergent supply device which is easily installed in a cabinet of the washing machine, and is not exposed to the outside of the cabinet. The detergent supply device includes a detergent container and a handle, and is seated in a reception chamber defined at an upper portion of the cabinet. Locking slots are formed on side mounting parts of the handle, and locking projections are provided on opposite sidewalls of the reception chamber, so as to have the locking projections be inserted into the locking slots where the handle is downwardly rotated. A cover is hinged to an upper portion of the reception chamber so as not to expose the detergent supply device to the outside. At least one hook is provided on a front end of the cover, and at least one hook hole is formed on a front portion of the reception chamber to engage with the hook, so as to have the cover openably cover the upper portion of the reception chamber.