A binding device for horticulture for binding a tape by cutting and bending a tape overlapping part is provided.In the binding device, a blade (4) is attached to one of an arm (3) or a main body (2), and a blade receiver (5) is attached to the other of them facing with each other. The blade (4) and the blade receiver (5) form cutting to a tape overlapping part, and the blade (4) has a shape for cutting and bending the tape to form a locking to the inner end of the cut tape as well as the blade receiver (5) is formed to pull the cut tape out therefrom in an outer end direction, so that the tape can be maintained in a bound state by locking the tape itself.