The present invention relates to a filter device (1), particularly an oil filter, having a filter housing cover (2) bounding a receiving chamber (5), in which a ring filter element (6) is disposed, having a housing (4) in which a dome (15) is centrally disposed, and onto which the filter housing cover (2) can be threaded, having at least one intermediate piece (3) disposed on the filter housing cover (2) threaded onto the housing (4) between the filter housing cover (2) and the housing, having an inlet channel (7) on the housing side communicating with an unfiltered side of the ring filter element (6) and an outlet channel (8) on the housing side communicating with a clean side of the ring filter element (6), having an idler channel (9) on the housing side, through which the receiving chamber (5) can be emptied when the filter housing cover (2) is removed, having a closure device (11) rotatably disposed about the filter axis (10) comprising a closure element (12) by means of which the idler channel (9) can be closed off.