A screw conveyor including a container-type main body provided with a storage tank; a horizontally oriented delivery pipe a front end of which is connected to the storage tank; a discharge pipe connected to a rear end of the delivery pipe and arranged inclined upwards from a connecting end to another end; a screw arranged across an inside of the storage tank and the delivery pipe; a drive mechanism configured to apply rotation to the screw via a rotation transmission section on a front section of the storage tank on an opposite side to the delivery pipe; and a screw support structure in which multiple support blocks configured to slidably contact the screw are fixed to an inside surface of the delivery pipe at different positions, and in which one or two or more of the support blocks are fixed to a front side of the delivery pipe.