To solve the problems with a conventional crusher that a measure against the abrasion of teeth is necessary and that the size of a charged object to be crushed is limited.

In crushing teeth of the invention, a pair of first and second crushing disks are installed uprightly so as to face each other with a crushing gap with a certain width; at least one of the crushing disks is made rotary; unit base plates 54 formed by dividing a crushing plane 40 into several pieces are freely separably attached to the base disks of the first and second crushing disks; and divided blades 57, 57a, etc., are freely separably attached to pedestals 56, 56a, etc., which are freely separably attached to the unit base plates 54. A measure against the abrasion of blades is taken by exchanging the divided blades 57, 57a, etc., attached via the unit base plates 40 and the pedestals 56, 56a, etc., to the first and second disks; and biting a large-size object to be crushed is made possible by setting the heights of the pedestals 56, 56a, etc., and divided blades 57, 57a, etc., for biting the objects.