A filter device 10 for fluids, especially for motor oil, hydraulic oil, has a filter case 1 comprising one or two filter inlets 2 and one filter outlet 3. The filter case contains one filter 4 consisting of at least two ring-shaped filter elements 7, 8 which concentrically enclose a central tube 18 of the filter device. In a channel 14 between the two adjacent filter elements there is a duct 16 which is run in the form of a spiral around inner filter element 8 and is embedded in filter 4. In duct 16 there is a pressure-controlled regulating valve 9 which opens when a certain level of pressure is exceeded in the filtered oil.