To provide the spreading structure of a spreading blade for crushing which is excellent in strength, dispersion of spreading, spreading stress, etc., and can obtain large crushing force.

The spreading blade is composed of right and left spreading blades for crushing, a core which is held between the right and left spreading blades and spreads the blades. and a hydraulic cylinder for forward/backward moving the core. A fan-shaped connection part is formed in the base end part of the core. A pike-shaped tip push opening part having a sharp tip is formed in the tip part of the connection part. Both sides of each of the connection part, the tip push opening part, and an intermediate push opening part are made taper surfaces of the same angle. On the inside surfaces of the right and left spreading blades, taper surfaces of the same shape with each taper surface of the core are formed.