A dishwasher includes a dishwashing compartment and a rack provided in the dishwashing compartment for holding items to be cleaned. A rotatable spray arm is associated with the rack for applying water or wash liquor liquid upon the items. Water or wash liquor liquid is supplied to the spray arm via an upright supply tube having at least one region which flares in a direction of the spray arm and a peripheral terminal end facing the spray arm. The terminal end of the supply tube is configured to project into the cavity and thereby is extended into the spray arm.