To provide a crusher capable of driving discharge blades without being affected by the size or deposition of pieces to be crushed.

The crusher 1 is equipped with a charge hopper 10 in which a material to be crushed is charged, a crushing treatment part 20 for crushing the material to be crushed and a discharge duct 30 for discharging the crushed material to be crushed to the outside. A discharge vane 26 for sweeping off the material to be crushed to the discharge duct 30 is provided in the crushing treatment part 20 and constituted of a rotary shaft 26a rotated axially in a crushing chamber 21 and the rotary blades 26b attached to the outer peripheral surface of the rotary shaft 26a. The rotary blades 26b can be shaken toward the rear in the rotary direction of the rotary shaft 26a.