Filter cartridge.

Filter insert consisting of a plurality of arranged in a zigzag-shaped folding of fold walls for a in the direction from one edge region of the zigzag folding towards the opposite edge region of the fold by the use of light passing medium to be filtered, comprising a for projecting medium to be filtered permeable material from each fold wall in the direction of an adjacent fold wall, produced by stamping projections which extend in the direction of movement of the medium and, in particular its width exceeding having length, wherein the projections of mutually adjacent fold walls for distance protection and stiffening abut one another and increase the abutting projections of two connected via a fold edge fold walls in the direction of the opposite fold edge in height, and the projections (30, 45) transversely to the movement direction of the medium have a constant width and the side walls (300) of the projections (30 , 45) extend perpendicular to the pleat walls (15 to 22, 40, 41, 43, 44) fold edges interconnecting means (23 to 29, 46).