An air cleaner may include a first body having an inlet and an outlet formed above the inlet. The air cleaner may also include a second body disposed above the first body and guiding air discharged from the outlet in a radially outward direction, wherein the second body comprises: a lower cover disposed above the outlet and extending upwardly as it goes in a radially outward direction; a top cover disposed separably to the lower cover; an upper cover disposed between the lower cover and the top cover. The upper cover may include a plate and a protruding cover that protrudes upward from the plate. The top cover may have a hole opened in up-down direction such that the protruding cover is disposed. A groove may be formed at the plate, and the groove may be depressed downward at a periphery of the protruding cover.