PURPOSE: To miniaturize the continuous press for sludge, etc., by forming the initial filled part at the foremost part.

CONSTITUTION: A filtration part 11 is provided around the full length of a screw shaft 13 to form a dehydration zone S, a supply port 121 is furnished to the side wall 12 provided at the front part of the zone S, and sludge, etc., are sent under pressure from the port 121 through a flocculating and kneading closed vessel 21. As a result, since the initial filled part can be formed at the foremost part of the filtration part 11, the filling rate of the sludge to be supplied to the dehydration zone S is increased, the filtration area is increased, the dehydration efficiency and throughput are also improved, and further the press can be miniaturized.