Robot cleaner

A robot cleaner comprising:

• a cleaner body equipped with a control unit and a driving wheel of which is driving is controlled by the control unit;
• a cleaning nozzle mounted inside an opening portion opening downwardly in a lower portion of the cleaner body, and configured to ascend or descend relative to the cleaner body according to changes in a height of a cleaning surface on which the cleaner body travels;
• a nozzle accommodation unit installed in the cleaner body to cover an upper portion of the cleaning nozzle;
• a brush module mounted to be accommodated in the cleaning nozzle;
• a brush driving part mounted in an end portion of one side of the cleaning nozzle and configured to drive the brush module;
• and
• a suction flow path part connecting the cleaning nozzle to the nozzle accommodation unit to suck foreign materials swept away by the brush module, and configured to elastically support the cleaning nozzle to ascend or descend and correct an asymmetric load on the brush driving part.