Binding machine and cutting blade used for binding machine

A binding machine comprising:

• a punching blade for punching a punched hole while forming a cut-and-raised piece in a plurality of sheets;
• a cutting blade provided adjacently to this punching blade and punching a cut hole for locking the distal end side of the cut-and-raised piece;
• a base portion for holding the punching blade and the cutting blade;
• and
• a punch stand disposed on this base portion through a gap for sheet insertion:
• by performing a punching operation so that the punching blade and the cutting blade held on the base portion penetrate the sheet inserted in the gap for sheet insertion and protrude to the punch stand side, a punched hole and a cut hole are formed in the sheet:
• and by performing a withdrawing operation so that the cutting blade and the punching blade are returned to the base portion side in a state while the distal end side of the cut-and-raised piece cut and raised from the punched hole to the punch stand side is engaged with the cutting blade, the cut-and-raised piece penetrates the cut hole and the sheets are bound:
• the cutting blade comprising:
• a first blade having a window with which the cut-and-raised piece is engaged and forming a first slit;
• and
• a second blade for forming a second slit extending in a direction of the punched hole from the midstream of the first slit:
• also configured such that an edge from a wide width portion of the cut-and-raised piece to a base end thereof can be engaged with the second slit.