To provide a binding auxiliary instrument which easily binds objects to be bound, allows a powerless woman to reliably bind them, and is reusable.

A plate-shaped member having a raised portion formed by raising a circumferential portion is provided with first and second notch grooves having the same shape, at a position corresponding to the raised portion. In addition, third and fourth notch grooves are formed at the raised portion vertical to the line connecting the first and second notch grooves.