A robot cleaner comprising: a cleaner body; a suction unit configured to suck air containing dust to be introduced into the cleaner body; and a dust container detachably coupled to the cleaner body, the dust container configured to collect dust filtered from the air introduced into the cleaner body, wherein the dust container includes: an external case including at least one cyclone (147a, 147b) configured to filter dust in air introduced into the dust container, and an exit configured to discharge air from the dust container; an upper case coupled to an upper portion of the external case, the upper case including an upper opening corresponding to a space into which air passing through the cyclone (147a, 147b) is discharged; an upper cover detachably coupled to the upper case configured to close the upper opening; and a filter mounted on the upper cover, the filter covering the discharged space of the air passing through the cyclone (147a, 147b) when the upper cover is coupled to the upper case, to filter dust in the air passing through the cyclone (147a, 147b), wherein an upper side of the filter is spaced apart from a rear surface of the upper cover, and wherein air passing through the filter is discharged to the exit of the external case through an empty space formed between the filter and the rear surface of the upper cover. a cleaner body; a suction unit configured to suck air containing dust to be introduced into the cleaner body; and a dust container detachably coupled to the cleaner body, the dust container configured to collect dust filtered from the air introduced into the cleaner body, wherein the dust container includes: an external case including at least one cyclone (147a, 147b) configured to filter dust in air introduced into the dust container, and an exit configured to discharge air from the dust container; an upper case coupled to an upper portion of the external case, the upper case including an upper opening corresponding to a space into which air passing through the cyclone (147a, 147b) is discharged; an upper cover detachably coupled to the upper case configured to close the upper opening; and a filter mounted on the upper cover, the filter covering the discharged space of the air passing through the cyclone (147a, 147b) when the upper cover is coupled to the upper case, to filter dust in the air passing through the cyclone (147a, 147b), wherein an upper side of the filter is spaced apart from a rear surface of the upper cover, and wherein air passing through the filter is discharged to the exit of the external case through an empty space formed between the filter and the rear surface of the upper cover. an external case including at least one cyclone (147a, 147b) configured to filter dust in air introduced into the dust container, and an exit configured to discharge air from the dust container; an upper case coupled to an upper portion of the external case, the upper case including an upper opening corresponding to a space into which air passing through the cyclone (147a, 147b) is discharged; an upper cover detachably coupled to the upper case configured to close the upper opening; and a filter mounted on the upper cover, the filter covering the discharged space of the air passing through the cyclone (147a, 147b) when the upper cover is coupled to the upper case, to filter dust in the air passing through the cyclone (147a, 147b), wherein an upper side of the filter is spaced apart from a rear surface of the upper cover, and wherein air passing through the filter is discharged to the exit of the external case through an empty space formed between the filter and the rear surface of the upper cover.