An air cleaner, comprising: a cylindrical case (101, 201) including a n inlet (102, 202) through which air is suctioned in a radial direction into the cylindrica 1 case; a filter (120, 220) configured to be detachably provided in the case and having a cylindrical shape; and a filter frame configured to support the filter, wherein the f ilter frame includes: a lower frame provided at a lower portion of the filter; an up per frame provided at an upper portion of the filter; and a plurality of supporting frames that extends toward the upper frame from the lower frame, wherein: the plurality of supporting frames is arrayed in a circumferential direction along a rim portion of the lower and upper frames (131, 132) and is configured to support an outer circumferential surface of the filter (120, 220), and an entry portion is formed between the plurality of support frames, the entry portion being configured with an insertion portion to receive the filter, wherein the lower frame, the upper frame, and the plurality of supporting frames form a mounting space for the filter, and the filter is movable toward the mounting space through the insertion portion in the radial direction to be mounted therein, the air cleaner characterized in that the plurality of supporting frames includes: two first frames (135a, 135b); and at least one second frame (135c, 135d) provided in a space between the two first frames, and wherein the entry portion is formed between the two first frames, and a distance between the two first frame (135a, 135b) in a circumferential direction is longer than a distance between one of the at least one second frame (135c, 135d) and one of the first frames (135a, 135b). the plurality of supporting frames is arrayed in a circumferential direction along a rim portion of the lower and upper frames (131, 132) and is configured to support an outer circumferential surface of the filter (120, 220), and an entry portion is formed between the plurality of support frames, the entry portion being configured with an insertion portion to receive the filter, wherein the lower frame, the upper frame, and the plurality of supporting frames form a mounting space for the filter, and the filter is movable toward the mounting space through the insertion portion in the radial direction to be mounted therein, the air cleaner characterized in that the plurality of supporting frames includes: two first frames (135a, 135b); and at least one second frame (135c, 135d) provided in a space between the two first frames, and wherein the entry portion is formed between the two first frames, and a distance between the two first frame (135a, 135b) in a circumferential direction is longer than a distance between one of the at least one second frame (135c, 135d) and one of the first frames (135a, 135b). two first frames (135a, 135b); and at least one second frame (135c, 135d) provided in a space between the two first frames, and wherein the entry portion is formed between the two first frames, and a distance between the two first frame (135a, 135b) in a circumferential direction is longer than a distance between one of the at least one second frame (135c, 135d) and one of the first frames (135a, 135b).