A self-propelled cleaning robot that is adapted to self-travel on and clean a flat surface of a structure installed outside, the self-propelled cleaning robot comprising: a robot body in which a self-propelled moving means is provided; and a cleaning unit that is provided in a side surface of the robot body, wherein the cleaning unit includes: a rotatable brush that includes a shaft unit and a brush unit provided on the shaft unit; and an airflow forming cover that extends along the axis direction of the shaft unit of the brush and is provided in the cleaning unit between the brush and the side surface of the robot body so as to cover a portion from a side of the robot body to an upper portion of the brush on an opposite side to the flat surface during cleaning of the flat surface, wherein the airflow forming cover is formed such that an inner surface of the airflow forming cover on the side of the brush is recessed from the brush and forms a recessed space, and is formed into an inverse chevron shape in section, wherein the brush is exposed to the outside in radial directions except for the airflow forming cover, wherein the brush is controlled so as to rotate during cleaning of the flat surface in such a way that a) below the shaft unit of the brush, an outward airflow is generated outward from the robot body in association with the movement of the brush unit, whereas above the shaft unit of the brush, an inward airflow is generated toward the robot body, and the inward airflow is returned to the outward airflow outward from the robot body by the airflow forming cover, so that dust floated from the flat surface is blown away; or b) below the shaft unit of the brush, an inward airflow is generated toward the robot body in association with the movement of the brush unit, so that dust floated from the flat surface flows in the airflow forming cover, whereas above the shaft unit of the brush, an outward airflow is generated outward from the robot body, so that dust floated from the flat surface can fly away outwardly. a robot body in which a self-propelled moving means is provided; and a cleaning unit that is provided in a side surface of the robot body, wherein the cleaning unit includes: a rotatable brush that includes a shaft unit and a brush unit provided on the shaft unit; and an airflow forming cover that extends along the axis direction of the shaft unit of the brush and is provided in the cleaning unit between the brush and the side surface of the robot body so as to cover a portion from a side of the robot body to an upper portion of the brush on an opposite side to the flat surface during cleaning of the flat surface, wherein the airflow forming cover is formed such that an inner surface of the airflow forming cover on the side of the brush is recessed from the brush and forms a recessed space, and is formed into an inverse chevron shape in section, wherein the brush is exposed to the outside in radial directions except for the airflow forming cover, a rotatable brush that includes a shaft unit and a brush unit provided on the shaft unit; and an airflow forming cover that extends along the axis direction of the shaft unit of the brush and is provided in the cleaning unit between the brush and the side surface of the robot body so as to cover a portion from a side of the robot body to an upper portion of the brush on an opposite side to the flat surface during cleaning of the flat surface, wherein the airflow forming cover is formed such that an inner surface of the airflow forming cover on the side of the brush is recessed from the brush and forms a recessed space, and is formed into an inverse chevron shape in section, wherein the brush is exposed to the outside in radial directions except for the airflow forming cover, wherein the brush is controlled so as to rotate during cleaning of the flat surface in such a way that a) below the shaft unit of the brush, an outward airflow is generated outward from the robot body in association with the movement of the brush unit, whereas above the shaft unit of the brush, an inward airflow is generated toward the robot body, and the inward airflow is returned to the outward airflow outward from the robot body by the airflow forming cover, so that dust floated from the flat surface is blown away; or b) below the shaft unit of the brush, an inward airflow is generated toward the robot body in association with the movement of the brush unit, so that dust floated from the flat surface flows in the airflow forming cover, whereas above the shaft unit of the brush, an outward airflow is generated outward from the robot body, so that dust floated from the flat surface can fly away outwardly. a) below the shaft unit of the brush, an outward airflow is generated outward from the robot body in association with the movement of the brush unit, whereas above the shaft unit of the brush, an inward airflow is generated toward the robot body, and the inward airflow is returned to the outward airflow outward from the robot body by the airflow forming cover, so that dust floated from the flat surface is blown away; or b) below the shaft unit of the brush, an inward airflow is generated toward the robot body in association with the movement of the brush unit, so that dust floated from the flat surface flows in the airflow forming cover, whereas above the shaft unit of the brush, an outward airflow is generated outward from the robot body, so that dust floated from the flat surface can fly away outwardly.