To solve carrying failure caused by a carrying object between a shaft and a spiral blade in carrying by a solidifying/press-fitting phenomenon, while simultaneously dehydrating leaves having the large surface area and becoming bulky by sticking when getting wet with water, a raw material of pickles and a residue such as waste of the pickles, in a screw dehydrator.

A space is made by partially cutting off a blade of a solidifying position between screw spiral blades by rotary compression, and a projection is projected in its void from a casing external part, and the solidified-compressed carrying object is released, and is dehydrated and carried again by compressive dispersion.