To impart phase difference to the oscillating motion of dies on both sides, based on material information before pressing.

In the flying press in which composite motion is carried out with reduction mechanisms 3 for making the dies 2 which are arranged on both sides of the width direction of a material 1 move back and forth in the width direction and oscillating devices 4 for making the dies move back and forth in the conveying direction of the material, a controller 5 for imparting the phase difference to the oscillating motion of the dies 2 on both sides is provided in order to prevent the bend of the material 1 after pressing when performing the edging pass of the material 1.