Abstract: An apparatus for conveying untreated materials includes a unit conveyor (25), and a collective conveyor (33). The unit conveyor (25) is constituted of a carriage (19) operated so as to move along a treatment line (1) composed of a plurality of treatment vessels arranged in a row, and carriers (16) provided so that they are moved vertically by the carriage (19) so as to lift and lower from and into the interior of a treatment vessel, while the collective conveyor (33) is constituted of elevator frames (26) provided along the treatment line (1) within the zone of movement of the carriage (19), lifting gears (27) adapted to move the elevator frames (26) in the vertical direction, and supports (28) which are provided on the elevator frames (26) respectively so as to be moved in the direction of the treatment line (1) and which are adapted to support the untreated materials (15).