To improve efficiency of transportation by providing a first portion with an opening, and providing a tubular case capable of guiding bulk materials from the opening and coaxially arranged screws in the case, in the tubular case including the first portion rotatable axially to a second portion.

A lower first portion 6a of a tubular case of a lower conveyer 3 is axially rotatable about an upper second portion 6b by a command, and the upper second portion 6b is fixed to a rotating portion 4b under a case of a lift conveyer 2. The rotatable first portion 6a guides a material from an opening into the case. Screws 8 are coaxially arranged in the case, rotated by a command, and conveys the material axially. A first gear reduction gear 9 drives a rotatable portion 6a of the case via a flange, and a second gear reduction gear 10 drives a shaft of the screws 8. The rotations of the first portion 6a and the shaft of the screws 8 are independent, so that relative rotation speed can be selected widely.