Abstract: Disclosed is a filter assembly for a vacuum cleaner, comprising a dust container having a desired-sized storing space and an upper opening; an inclined guide provided at an upper and outer circumferential surface of the dust container; a cover having a through-hole for sucking external air and disposed to cover the upper opening of the dust container; a fixing lever disposed at an outside of a rim of the cover so as to be slid and having a protrusion protruded toward an inner side of the cover, the protrusion being slid while contacted with the inclined guide, whereby the cover being closely contacted with the dust container; and a filter removably disposed at a filter mounting portion formed by opening a portion of a wall of the dust container. Therefore, it is facile that the cover 120 is closely contacted with the dust container using the inclined guide provided at the dust container and the fixing lever disposed at the cover so as to be contacted with the inclined guide and slid.