Air cleaner in particular of an internal combustion engine

The present invention relates to an air cleaner (10) in particular of an internal combustion engine in particular of a motor vehicle, comprising a housing (12) with a slide-in opening (32) for inserting a slide-in filter element (30) and a cover element (58) for closing the slide-in opening (30). The cover element (58) comprises at least one one-piece snap element (66) for fixing the cover element (58) at the housing (12). An angle (64) between a main plane (50) of a sealing face (46) of the housing (12) for a sealing (48) between the filter element (30) and the housing (12) and a main plane (54) of a contact face (62) of the cover element (58), to which a corresponding contact face (52) of the housing (12) abuts in a closing state of the cover element (58), is different from 90°.