In the crusher of the present invention, a rotary blade section has blades for roughly crushing a member to be crushed. A fixed blade section has a plurality of blades which are linearly arranged. A movable blade section has a plurality of blades which are linearly arranged and capable of engaging with the blades of the fixed blade section. The movable blade section is capable of swinging to move close to and away from the fixed blade section. A driving mechanism swings the movable blade section with the rotation of the rotary blade section. With this structure, the crushed members, which have been roughly crushed by the rotary blade section, are crushed into grains between the fixed blade section and the movable blade section.