Abstract: A toner vessel for use in a copying machine includes a square dish-shaped vessel body which is open at the upper part, is provided with an outwardly projecting flange at the peripheral edge of said opening and receives the toner therein. A cover sheet is folded on itself to define an upper part and a lower part. The opening of the vessel body is covered with the lower part of the folded cover sheet and the latter's periphery is fitted on said flange. The surface of the upper part, in the vicinity of the fore end of the upper part, is adhered to the back surface of a cover plate arranged movably in the horizontal direction on the surface of the cover sheet upper part.