A filter device for fluids, especially for fuels such as diesel fuel, includes a filter housing (1) defining a longitudinal axis (19). The filter housing has a fluid inlet (14) and a fluid outlet (24) and can accommodate at least one filter element (9). The fluid can, during filtering, flow through a filter medium (11) surrounding an inner filter cavity. The filter element (9) is enclosed by an end cap (21) on its lower end facing the bottom part (5) of the filter housing (1). The end cap has a passage (29) forming a fluid connection to the inner filter cavity (17) and can be fixed to an element retainer (23) of the filter housing (1). The element retainer (23) includes retaining piece (35) on the bottom part (5) of the filter housing (1). The retaining piece is open towards the filter element (9) with a fluid channel (37) leading to a housing connection (24) running into it. The end cap (21) of the filter element (9) has a connecting piece (27) accommodated in the retaining piece (35) and secured in a supporting zone. The retaining piece (35) forms an opening (43) forming a fluid connection to the fluid channel (37) leading to the element retainer (23) and including a sealing arrangement (45, 47) sealing the opening from the open end of the retaining piece.