To provide a cutting device for a columnar rigid body ingot, having a simple structure and facilitating maintenance.

This cutting device 20 is mainly composed of a grinding wheel box body 23 covering a part of the columnar rigid body ingot 21 to be ground and properly moving on the columnar rigid body ingot 21 according to a cutting point. Surface cutting of the columnar rigid body ingot 21 is conducted in the grinding wheel box body 23, and a sucking pipe 31 is connected to the grinding wheel box body 23, thereby sucking the inside of the grinding wheel box body 23. Therefore, the grinding wheel box body 23 conducts surface cutting of the columnar rigid body ingot 21 by moving on the columnar rigid body ingot 21 to be ground, while sucking cutting chips 33.