To provide a device for automatically cutting and manufacturing a sponge stuck on a punching die for separating a punched product from a punching blade from a long stripe-like sponge.

Based on CAD data of a cutting edge 2 in a trimming die 1, the whole cutting length is determined from the long stripe-like sponge and a cut-in part 43 is formed at a direction transferring point on the midway or a circular portion by a metal die, and thereby, the sponge stuck on the trimming die 1 is cut. The metal die for cutting the sponge includes, for example, four kinds of cutting edges, and the respective blades are properly used based on the CAD data of the cutting edge 2.