An air cleaner comprising: a case 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 , 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 (S1); and a second flow path inlet through which air having passed through the first inlet flows, the second inlet having a second width (S2) 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 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 , 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 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 , 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 (S1); and a second flow path inlet through which air having passed through the first inlet flows, the second inlet having a second width (S2) greater than the first width, a first flow path inlet having a predetermined first width (S1); and a second flow path inlet through which air having passed through the first inlet flows, the second inlet having a second width (S2) 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 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 , 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 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 , and a plurality of lower inlets formed from a lower portion of the case 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 , 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 . <EOS>