An air cleaner comprising: a case (101, 201) including a first suction inlet, the case having a cylindrical or cone shape; a fan housing provided inside of the case, the fan housing accommodating a fan therein; a filter provided at a suction side of the fan, the filter filtering foreign materials in air which is suctioned through the first suction inlet; and a housing suction flow path formed between an outer surface of the fan housing and an inner surface of the case (101,201), the housing suction flow path allowing air which is suctioned through the first suction inlet to flow toward and through the filter, wherein the housing suction flow path includes: a first flow path inlet having a predetermined first width; and a second flow path inlet through which air having passed through the first inlet flows, the second inlet having a second width greater than the first width, characterized in that: the first suction inlet comprises: a plurality of lower inlets formed from a lower portion of the case (101, 201) to a height at which the filter is located, and a plurality of upper inlets formed from an upper side of the plurality of lower suction portions to an upper portion of the case (101, 201), and the housing suction flow path communicates with the upper inlets and allows air which is suctioned through the upper inlets to flow toward the filter. a case (101, 201) including a first suction inlet, the case having a cylindrical or cone shape; a fan housing provided inside of the case, the fan housing accommodating a fan therein; a filter provided at a suction side of the fan, the filter filtering foreign materials in air which is suctioned through the first suction inlet; and a housing suction flow path formed between an outer surface of the fan housing and an inner surface of the case (101,201), the housing suction flow path allowing air which is suctioned through the first suction inlet to flow toward and through the filter, wherein the housing suction flow path includes: a first flow path inlet having a predetermined first width; and a second flow path inlet through which air having passed through the first inlet flows, the second inlet having a second width greater than the first width, a first flow path inlet having a predetermined first width; and a second flow path inlet through which air having passed through the first inlet flows, the second inlet having a second width greater than the first width, characterized in that: the first suction inlet comprises: a plurality of lower inlets formed from a lower portion of the case (101, 201) to a height at which the filter is located, and a plurality of upper inlets formed from an upper side of the plurality of lower suction portions to an upper portion of the case (101, 201), and the housing suction flow path communicates with the upper inlets and allows air which is suctioned through the upper inlets to flow toward the filter. the first suction inlet comprises: a plurality of lower inlets formed from a lower portion of the case (101, 201) to a height at which the filter is located, and a plurality of upper inlets formed from an upper side of the plurality of lower suction portions to an upper portion of the case (101, 201), and a plurality of lower inlets formed from a lower portion of the case (101, 201) to a height at which the filter is located, and a plurality of upper inlets formed from an upper side of the plurality of lower suction portions to an upper portion of the case (101, 201), and the housing suction flow path communicates with the upper inlets and allows air which is suctioned through the upper inlets to flow toward the filter.