Abstract: A supplying inlet is placed at a position where materials to be crushed supplying direction is offset on the forward direction side of a rotating direction relative to the rotating center of the rotation wing on the supplying side and a discharge outlet is placed at a position where crushed product discharge direction is offset on the forward direction side of a rotating direction relative to the rotating center of the rotation wing on the discharge side; and a casing on supplying side and a casing on discharge side are fitted so as to be separable from each other. Thereby retention time in the casing of crushed product is short, heat degeneration is little, and a good product can be obtained; and maintenance and cleaning are made easier.