PURPOSE: To smoothly throw waste documents, etc., while preventing adhesion and retention of waste documents by disaggregating and tearing waste documents, etc., in water and letting water separated and removed from the treated material flow on the surface of a throw guide member of waste documents in the same direction as that of the throw direction.

CONSTITUTION: Waste documents, etc., are disaggregated and torn in water filled in a casing 1 by an agitating and disaggregating means 3. Water separated and removed from the treated material is made to flow on the surface of a throw guide member 51 in the direction as that of the throw direction of waste documents, etc.