Punching device

A punching device for punching a workpiece into a predetermined shape using a die and a punch, the die including a mold with a hole having the predetermined shape, and the punch including a mold having the predetermined shape, the device comprising:

• load sensors which are disposed respectively at positions where a force applied to the die is transmitted in the punching device, and measure a load in a punching direction at each of at least three predetermined points different from each other in the die;
• and
• a control device that calculates a first moment, which is a sum of moments of the measured load around a first axis, and a second moment, which is a sum of moments of the measured load around a second axis, with respect to the first and second axes on a plane perpendicular to the punching direction, and determines that foreign matter is generated in a case where a magnitude of at least one of the first and second moments is deviated from a range of predetermined values.