Abstract: The invention relates to a filter press having a plurality of filter plates forming filter chambers between each other. A pressing diaphragm is supported on the filter plates. The pressing diaphragm is provided with an edge strip that extends all around. The edge strip is welded to a support wall of the filter plate, whereby the edge strip, on its side facing away from the support wall, is provided with transversely extending cutouts. Provision is made between the edge strip and the plate frame for a filtrate channel into which filtrate drain ducts feed, these ducts lead to a filtrate outlet.