To provide a cutting device of a storage battery in which a content can be taken out by cutting the storage battery safely, and which is remarkably superior in safety, and to provide a cutting method of the storage battery.

This is equipped with the storage battery fixing mechanism for fixing the storage battery at a prescribed position, the cutting machine body of which at least a blade edge is consisting of a nonconductive material and which is equipped with a rotating rotary blade, and a cutting position adjusting mechanism which is equipped in the cutting machine body and adjusts the cutting position of the rotary blade at a prescribed position. The storage battery fixed at a prescribed position by the storage battery fixing mechanism is cut at an insulation cutting position by the rotary blade adjusted at the prescribed cutting position by the cutting position adjusting mechanism.