An assembly of elongate, substantially parallel, interlinked staples includes multiple paper-made staples. For binding a plurality of binding sheets, the leg portions of a staple are bent in a first direction, inserted through the binding sheets, and bent in a second direction along the binding sheets to be mutually bonded. Each staple has interlinking portions, for mutually interlinking adjacent staples, in the vicinity of the ends thereof and a slit between the interlinking portions to separate the mutually interlinked staples. The first leg portion of each staple has an adhesion portion in the vicinity of the opposite end thereof for mutually bonding both the leg portions when the leg portions are bent in the second direction. Each staple is tapered at each end towards the tips of the staple. Each staple has a hole between the slit and the interlinking portion.