A staple apparatus of the present invention comprises a staple wire unit for storing a staple wire as a roll-like form which provides a staple with which a stack of sheet materials is bound, a feeding roller for feeding the staple wire which is stored in the storage section in accordance with a stacked amount of sheets, a cutting device for cutting the staple wire fed by the feeding roller to form a staple, a conveying clip for conveying the staple formed by the cutting device to a predetermined position, and a stapling apparatus bending the staple conveyed by a conveying clip to the predetermined position to staple the stacked sheet materials.