To reduce running costs and equipment costs by bringing entire surfaces of noodle strings carried on a conveyor into contact with steam. High-temperature steam is upwardly supplied from a steam pipes 30 installed on a lower cover 24, by running a delivery belt lane 36a of a belt conveyor 28 through a steam chamber 26. The belt conveyor 28 is equipped with an endless belt 36, whose delivery lane 36a passes through the steam chamber 26. The belt 36 is a thin, mesh belt positioned so as to partition the steam chamber 26 into an upper steam chamber 26a and a lower steam chamber 26b.
