A process for producing or continuously producing a preparation for oral administration,the preparation comprising a first water-swellable gel-forming layer as anoutermost layer, a second water-swellable gel-forming layer as another outermostlayer, and a drug enclosed in an enclosing part formed by bonding peripheral partsof the first and second water-swellable gel-forming layers to each other directlyor through an adhesive layer. This production process or continuous productionprocess comprises the following steps: (a) the step of forming a first water-swellablegel-forming layer, (b) the step of forming a recessed part in a given area of thefirst water-swellable gel-forming layer, (c) the step of packing a drug intothe recessed part formed, and (d) the step of forming a second water-swellablegel-forming layer over the packed drug directly or through an adhesive layerand bonding the layers together in a peripheral part surrounding the recessedpart.
