Binding device

A binding device which comprises a fixture having at least two binding rods, a cover plate having means for engaging with ends of the binding rods and an elastically displaceable connection providing a plurality of divided elastic piece members for interconnecting the fixture with the cover plate at their longitudinal ends, wherein the fixture, the cover plate and the elastic connection are integrally and displaceably formed, the elastic connection providing a hinge-like thin joint portion recessed in the reverse direction at their upper and lower end portions, a plurality of parallel hinge-like elastic piece members integrally connected with the cover plate and the fixture respectively, and a plurality of parallel elastic support plates integrally associated with the cover plate or the fixture at their one end between the hinge-like elastic piece members.