A drawer of a clothes treating machine includes a drawer frame that extends in a lengthwise direction and defines an inner space, and a storage unit disposed in the inner space of the drawer frame and configured to accommodate a clothes treatment agent therein. The drawer frame includes a housing accommodation part that defines a space separated from the inner space, a clothes treatment agent housing that is configured to be inserted into the housing accommodation part, and a protruding portion that separates the housing accommodation part and the clothes treatment agent housing from each other.