To improve the durability of a crushing tooth in a crusher and to easily vary a particle diameter of a fragment crushed by the crushing tooth.

By displacing a pair of crushing teeth 3a, 3b, left and right, relative to each other with respect to a meshing zone 3c, crushing forces at the time of crushing of fed blocks are equally applied to the teeth 3a, 3b, without being deviated to the tooth 3a or 3b, thereby to improve the durability thereof. And bearings 6a, 6b axially supporting the teeth 3a, 3b are supported on a bearing supporting body 1 so as to be displaced and stoppers 8a, 8b are fixed at the opposite ends of movement stroke of the bearings 6a, 6b, respectively, the bearings 6a, 6b being interposed between the stoppers 8a, 8b and spacers 10a, 10b having different plate thicknesses are interposed between the stoppers 8a, 8b and the bearings 6a, 6b, respectively. By replacing the spacers 10a, 10b having different thickness, clearance between the teeth 3a, 3b can be adjusted.