A forming plate and a driver plate are held at a front portion of a path of supplying connected staples in a laminated state. A staple in a C-shape formed at an inside of a strike out path formed between a front end face of a supply path and a back face of the face plate arranged on a front side of the supply path is pressed to supply to inside of the strike out path toward the face plate by a pusher urged by a spring. The staple is struck out by the driver plate. The pusher is made to constitute a first pusher, and a second pusher for pressing a leg portion of the staple to the face plate is aligned to be arranged to a side of a staple strike out port of the first pusher.