To provide a stacked sheets cutter capable of reading a cutting mark while gripping a stacked sheets by a gripper, automatically positioning the cutter and the stacked sheets, and cutting the stacked sheets with high accuracy.

The cutting mark of the stacked sheets 1 on a rotary table 2 is read by a camera 3 above the sheets while gripping the stacked sheets 1 by the gripper 8, the angle to a cutting blade 5a is adjusted by the rotary table 2 using the signal from a control device 4. In addition, the cutting mark on the side surface of the stacked sheets is read by a camera 6 mounted so as to read the side surface of the stacked sheets to detect the state of deviation of the cutting mark. A movable table 7 is moved by the signal from the control device 4 to position the stacked sheets.