PURPOSE: To enable high screening at a low pressure difference by providing internally a tapered core in a straight cylinder to be used for a centri-cleaner and making the annular space between both smaller toward the lower part.

CONSTITUTION: A titled dust remover consists of an upright cylinder 5 to be used for a centri-cleaner, an outlet 6 for the screened raw material provided at the center in the upper part of the cylinder 5, an inlet 7 for the raw material to be treated, a core 8 provided in the cylinder 5 so as to have the annular space (a) from the cylinder 5 smaller toward the lower part, and an outlet 9 for foreign matter provided at the bottom end of the space (a). The dust remover provides a high screening rate at a low pressure difference.