However, the relationship between strain-induced martensitic transformation and strain is only verified for strain in tensile test [7-9]. Therefore, we investigated the relationship with the strain-induced martensitic transformation using the above-mentioned precision blanking as a specific processing example of product manufacturing. In particular, we investigated the influence of martensitic transformation on the quality of the cut surface in finish blanking type FB using the two materials that different degree of strain-induced martensitic transformation.