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The present study reports the assisting effect by the ultrasonic vibration in a micro-coining process. Particularly, we were focused on the grain size of the work material to study the scale dependency of transferability under the assistance of ultrasonic vibration. The pure copper plate of 0.3 mm in thickness was used as the working material. The micro-coining process was performed on the specimens with three different grain sizes which were obtained through an annealing process. The result showed that the vibration assisted effect on transferability becomes more significant for the material with larger grain sizes. Assisting effect of ultrasonic vibration for the coarse grained materials is also demonstrated.