An adding device for dishwashers includes a fillable supply chamber for receiving a tablet-type detergent or rinsing agent. The supply chamber is arranged and configured in such a way that, when the adding device is in an operational position in the dishwasher, the detergent or rinsing agent can escape from the supply chamber into the rinsing area in a non-impeded manner in the direction of gravity. As a result, no substantial detergent residues remain in the supply chamber after the cleaning or rinsing program has come to an end. This results in the addition of cleaner into the dishwasher in an improved, reliable manner.