Abstract: A rotary-type sheet cutter for cutting a continuous sheet material comprising a stationary blade having an end edge extending along the widthwise direction of the sheet material; and a rotary blade having an end edge which rotates about a rotary axis extending along the widthwise direction of the sheet material during rotation of the rotary blade, the end edge of the rotary blade intersection-contacting with that of the stationary blade under pressure so as to cut the sheet material along the widthwise direction when the rotary blade rotates. The rotary blade is formed by bending a flat plate along a bend line which is brought into a state of extending along the widthwise direction of the sheet material, and the end edge and the bend line are arranged to form an angle opening toward a cutting starting side.