Abstract: Disclosed herein is a sheet shutter which is a shutter of the type in which a sheet-form shielding material is lifted and lowered to be used as a partition of the entrance or passage of factory, warehouse or the like. The sheet shutter comprises (a) a pair of sheet guides erected parallel with a predetermined spacing therebetween, each sheet guide having an uppr end; (b) a sheet case provided between the upper ends of the sheet guides; (c) a take-up drum rotatably supported within the sheet case, the take-up drum having an interior space; (d) a flexible sheet having a top edge and both of side edges, the both side edges being guided by the sheet guides in such a manner that the flexible sheet is lifted and lowered, and the top edges being attached to the take-up drum; and (e) a motor for rotationally driving the take-up drum, and motor being fixed to the sheet case and accommodated in the interior space of the take-up drum.