To provide a crusher which facilitates collection of reinforcements embedded in a concrete piece.

The crusher is formed of a frame 2 which is mounted on an arm of a hydraulic excavator, a fixed jaw 3 attached to the frame 2, and a movable jaw 4 attached to the frame 2 in a rockable manner. Then a grip-cum-tip crushing tooth 3a having a flat upper surface is arranged on the fixed jaw 3 in a manner protruding frontward, and a gripping tooth 4a having a lower flat surface corresponding to the upper surface of the grip-cum-tip crushing tooth 3a, is arranged on the movable jaw 4 in a manner protruding frontward. Further the tip of the grip-cum-tip crushing teeth 3a matches with the tip of the gripping tooth 4a. Furthermore the gripping tooth 4a has a lengthwise long shape.