A moving robot performing automatic traveling, the moving robot comprising: a main body; a driving unit moving the main body; a cleaning unit performing cleaning on a cleaning area in which the main body is positioned; a sensor sensing information related to the ground or the obstacle; and a controller controlling the driving unit on the basis of the information sensed by the sensor, wherein the driving unit includes: a plurality of pulleys; a motor connected to any one of the plurality of pulleys and generating a driving force; a belt rotated in contact with the plurality of pulleys; and a support member connected to some of the plurality of pulleys and changing a position of the pulley such that an area in which the belt is in contact with a ground or an obstacle is maintained to be equal to or greater than a reference area, when the area in which the belt is in contact with the ground or the obstacle is equal to or greater than the reference area, the main body passes through the ground or the obstacle without causing a slip to occur between the belt and the ground or the obstacle, and characterized in that the sensor senses information related to tension of the belt, and the controller controls the driving unit to maintain tension of the belt to be equal to or greater than reference tension on the basis of the information sensed by the sensor. a main body; a driving unit moving the main body; a cleaning unit performing cleaning on a cleaning area in which the main body is positioned; a sensor sensing information related to the ground or the obstacle; and a controller controlling the driving unit on the basis of the information sensed by the sensor, wherein the driving unit includes: a plurality of pulleys; a motor connected to any one of the plurality of pulleys and generating a driving force; a belt rotated in contact with the plurality of pulleys; and a support member connected to some of the plurality of pulleys and changing a position of the pulley such that an area in which the belt is in contact with a ground or an obstacle is maintained to be equal to or greater than a reference area, when the area in which the belt is in contact with the ground or the obstacle is equal to or greater than the reference area, the main body passes through the ground or the obstacle without causing a slip to occur between the belt and the ground or the obstacle, and characterized in that the sensor senses information related to tension of the belt, and the controller controls the driving unit to maintain tension of the belt to be equal to or greater than reference tension on the basis of the information sensed by the sensor. a plurality of pulleys; a motor connected to any one of the plurality of pulleys and generating a driving force; a belt rotated in contact with the plurality of pulleys; and a support member connected to some of the plurality of pulleys and changing a position of the pulley such that an area in which the belt is in contact with a ground or an obstacle is maintained to be equal to or greater than a reference area, when the area in which the belt is in contact with the ground or the obstacle is equal to or greater than the reference area, the main body passes through the ground or the obstacle without causing a slip to occur between the belt and the ground or the obstacle, and characterized in that the sensor senses information related to tension of the belt, and the controller controls the driving unit to maintain tension of the belt to be equal to or greater than reference tension on the basis of the information sensed by the sensor.