Abstract: A cutting insert of the present disclosure includes a top surface, a bottom surface, a side surface, and a corner cutting edge, a first cutting edge, a second cutting edge and a third cutting edge formed at a ridge line formed by the side surface and the top surface. The corner cutting edge has a first end and a second end. The first cutting edge extends from the first end in a first direction. The second cutting edge extends from the second end in a second direction. The third cutting edge extends from the second cutting edge in a third direction. The top surface has a first rake face adjacent to the first cutting edge, a second rake face adjacent to the second cutting edge, and a third rake face adjacent to the third cutting edge.

Abstract: There is provided a magnet screen device capable of satisfactorily displaying an image projected from a projector even at an edge portion of a screen sheet thereof. The magnet screen device comprises a screen sheet having a projection surface and a magnet surface opposed to the projection surface, and a roll part for rolling up the screen sheet. In non-use state of the device, the screen sheet is in a rolled-up position on the roll part such that the magnet surface is situated on the inside with respect to the projection surface in the rolled-up screen sheet.

Abstract: There is provided a magnet screen device capable of satisfactorily displaying an image projected from a projector even at an edge portion of a screen sheet thereof. The magnet screen device comprises a screen sheet having a projection surface and a magnet surface opposed to the projection surface, and a roll part for rolling up the screen sheet. In non-use state of the device, the screen sheet is in a rolled-up position on the roll part such that the magnet surface is situated on the inside with respect to the projection surface in the rolled-up screen sheet.