Abstract: A static crushing method capable of extremely safely and efficiently performing crushing operation by efficiently crushing the surface of an object to be crushed, an aid for static crushing used for the crushing method, and a filling tool. The static crushing method comprises the steps of forming a drilled hole (1) in the object to be crushed, filling an expandable crushing material in the drilled hole (1), and crushing the object to be crushed by the inflation of the crushing material, and is characterized in that the aid for static crushing having a bottom plate (3) disposed in the drilled hole, a top plate (20) larger in area than the bottom plate (3) and disposed on the outside of the drilled hole, and connection means (23) and (21) connecting these plates to each other is used to fill the crushing material, and the crushing material is disposed between the bottom plate and the top plate.