Dust removal device and dust removal method

A dust removal device that dusts a sheet-shaped object having an edge portion with a shape with protruding parts continuously arranged at certain intervals in the longitudinal direction and is provided with a discharge outlet and suction inlet facing the surface of the sheet-shaped object being conveyed and arranged at a predetermined interval along the conveyance direction of the sheet-shaped object and that discharges a gas from the discharge outlet to the surface of the sheet-shaped object while drawing in the gas above the surface of the sheet-shaped object through the suction inlet, wherein

• the discharge outlet includes
• a first discharge outlet which discharges the gas to a portion of the sheet-shaped object other than an edge portion in the width direction and
• a second discharge outlet which is separated from the first discharge outlet and discharges the gas to the edge portion of the sheet-shaped object more weakly than the first discharge outlet discharges the gas, and
• the suction inlet includes
• a first suction inlet which draws in the gas above the surface of the portion of the sheet-shaped object other than the edge portion, and
• a second suction inlet which is separated from the first suction inlet and draws in the gas above the surface of the edge portion of the sheet-shaped object more weakly than the first suction inlet draws in the gas.