A rotary electrostatic coating device using a pattern control airflow (Fp) to vary a diameter of a coating pattern determined by a helically swirling shaping airflow (Fs), comprising: a rotary head which causes paint to be discharged radially outward, a plurality of shaping air holes which are arranged at intervals on a first circle which is positioned further back than an outer peripheral part of said rotary head and which has the axis of said rotary head at its center, said shaping air holes directing paint discharged radially outward from the outer peripheral edge of the abovementioned rotary head toward a piece to be coated so as to produce a coating pattern, by means of a shaping airflow (Fs) which flows out from said shaping air holes, a plurality of control air holes which are arranged at intervals on a second circle which has a smaller diameter than said first circle and is positioned to the rear of the outer peripheral part of said rotary head and concentric with the abovementioned first circle, and first control means for controlling the flow rate of pattern control air which flows (Fp) out from said control air holes; said rotary electrostatic coating device being characterized in that, the abovementioned shaping air holes and the abovementioned control air holes are oriented in substantially the same torsion angle direction, opposite to the direction of rotation of the abovementioned rotary head; the axis of the abovementioned shaping airflow (Fs) passes through a position close to and radially outward from the outer peripheral edge of the abovementioned rotary head; and the axis of the abovementioned control airflow (Fp) intersects the axis of the abovementioned shaping air (Fs) at a position which is close to and radially outward from the outer peripheral edge of the abovementioned rotary head. a rotary head which causes paint to be discharged radially outward, a plurality of shaping air holes which are arranged at intervals on a first circle which is positioned further back than an outer peripheral part of said rotary head and which has the axis of said rotary head at its center, said shaping air holes directing paint discharged radially outward from the outer peripheral edge of the abovementioned rotary head toward a piece to be coated so as to produce a coating pattern, by means of a shaping airflow (Fs) which flows out from said shaping air holes, a plurality of control air holes which are arranged at intervals on a second circle which has a smaller diameter than said first circle and is positioned to the rear of the outer peripheral part of said rotary head and concentric with the abovementioned first circle, and first control means for controlling the flow rate of pattern control air which flows (Fp) out from said control air holes; said rotary electrostatic coating device being characterized in that, the abovementioned shaping air holes and the abovementioned control air holes are oriented in substantially the same torsion angle direction, opposite to the direction of rotation of the abovementioned rotary head; the axis of the abovementioned shaping airflow (Fs) passes through a position close to and radially outward from the outer peripheral edge of the abovementioned rotary head; and the axis of the abovementioned control airflow (Fp) intersects the axis of the abovementioned shaping air (Fs) at a position which is close to and radially outward from the outer peripheral edge of the abovementioned rotary head.