Cloth flattening device

The cost of the negative pressure source and the cloth flattening device is reduced, and/or the power consumption of the negative pressure source during the operation of the cloth flattening device is reduced. A cloth flattening device is provided with: a flattening unit having a flattening clip for flattening the upper edge of an inserted cloth in the left-right direction; and a carrying-out part which is provided with an intermediate moving body and a belt conveyor, the intermediate moving body moves backwards from the forward position and releases the upper edge part of the cloth collected from the flattening clip at the forward position and sucked and held on the upper surface. The carrying-out part is provided with a plurality of suction holes which are distributed in the upper surface of the middle moving body and at least in the range of the left-right direction corresponding to the maximum set width of the upper edge of the cloth in the left-right direction, and a plurality of suction holes which are