Abstract: A filter device includes a device housing (2) removably accommodating a filter element (26) with an element material (28) extending between two end members (32, 34). One end member (34) has a wall member (46) of a polygonal shape inserted into an accommodating space (66) of an accommodating member (36) attached to the device housing (2). The accommodating member (36) also has a polygon-shaped wall member (68). The wall members are disposed adjacent and facing each other in an accommodating state. The accommodating space (66) is delimited outwards by its wall member (68) with a polygonal shape. A further wall member (70) with a circular shape delimits the accommodating space (66) to the inside and passes through a circular transfer space (76) in the adjacently disposed end member (34).