The invention relates to a filter device, in particular for fluids polluted with admixtures of water, such as diesel oil, comprising a filter housing (1) which has a fluid inlet (43) and a fluid outlet (44) and in which at least one filter element (9) can be received. During the filtering process, the respective fluid can flow through the filter medium (11) of the filter element from the unfiltered side (14) to the filtered side (13) of the filter medium, which surrounds an inner filter cavity (17). On at least one side of the filter medium (11), a water-separating system (23) having a separating region (25) for separated water is present. The water separating system is connected via at least one water opening (35) that is open toward the separating region (25) to a water collecting chamber (45), and the filter element (9) has a passage (29) that forms a fluid connection to the inner filter cavity (17) and can be connected to an element receptacle (47) of the filter housing (1). The filter device is characterised in that a fluid-conveying system (41) is present, in which fluid paths separated from each other are formed, of which the first fluid path (59/69) leads from the fluid inlet (43) of the housing (1) to the unfiltered side (14) of the filter element (9) and the second fluid path (57) connects the respective water opening (35) to the water collecting chamber (45).