An electrostatic coating machine comprising: an air motor having an electric potential which is maintained at a ground level and that rotates a rotational shaft with compressed air supplied; a rotary atomizing head that is provided on the front side of the rotational shaft and is composed of a tubular body having an electric potential which is maintained at the ground level to spray paint, which is supplied while being rotated by the air motor, from a releasing edge in a front end; an external electrode member (6; 51) that is positioned in back of the rotary atomizing head and is provided on an outer peripheral side of the air motor to electrify paint particles sprayed from the releasing edge in the rotary atomizing head to be in a negative potential by applying a negative high voltage to a plurality of electrodes (6C; 51B); a shaping air spurting member that is formed in a tubular shape by using a conductive material and is arranged on an outer peripheral side of the rotary atomizing head in a state where a front end is positioned in an intermediate section of the rotary atomizing head in a length direction, the front end being provided with a plurality of air spurting holes (10, 12) over an entire circumference in a circumferential direction to spurt shaping air toward paint particles sprayed from the rotary atomizing head; a shield member that is provided on an outer peripheral side of a front side section of the shaping air spurting member and is formed of an annular body radially extending to shield electric flux lines traveling toward the rotary atomizing head from each of the electrodes (6C; 51B) in the external electrode member (6; 51), the shield member being formed as an annular plate body that extends from the outer peripheral side of the shaping air spurting member toward a radial outward direction; a tubular insulating member formed of an insulating material covering an outer peripheral surface of the shaping air spurting member is provided on an outer peripheral side of the shaping air spurting member; and a discharge buffering member (16; 41) of an annular insulating material or semi-conductive material is provided in a position where the shield member is separated from the tubular insulating member and the discharge buffering member (16; 41) is located between the shield member and the tubular insulating member, characterized in that a front surface of the discharge buffering member (16; 41) abuts on a rear surface of the shield member, a front surface (15C1) of the tubular insulating member abuts on a rear surface of the discharge buffering member (16; 41), and a front surface of the shield member is flush with a front surface of the shaping air spurting member, and the discharge buffering member (16; 41) is formed as an annular plate body facing a rear surface part of the shield member. an air motor having an electric potential which is maintained at a ground level and that rotates a rotational shaft with compressed air supplied; a rotary atomizing head that is provided on the front side of the rotational shaft and is composed of a tubular body having an electric potential which is maintained at the ground level to spray paint, which is supplied while being rotated by the air motor, from a releasing edge in a front end; an external electrode member (6; 51) that is positioned in back of the rotary atomizing head and is provided on an outer peripheral side of the air motor to electrify paint particles sprayed from the releasing edge in the rotary atomizing head to be in a negative potential by applying a negative high voltage to a plurality of electrodes (6C; 51B); a shaping air spurting member that is formed in a tubular shape by using a conductive material and is arranged on an outer peripheral side of the rotary atomizing head in a state where a front end is positioned in an intermediate section of the rotary atomizing head in a length direction, the front end being provided with a plurality of air spurting holes (10, 12) over an entire circumference in a circumferential direction to spurt shaping air toward paint particles sprayed from the rotary atomizing head; a shield member that is provided on an outer peripheral side of a front side section of the shaping air spurting member and is formed of an annular body radially extending to shield electric flux lines traveling toward the rotary atomizing head from each of the electrodes (6C; 51B) in the external electrode member (6; 51), the shield member being formed as an annular plate body that extends from the outer peripheral side of the shaping air spurting member toward a radial outward direction; a tubular insulating member formed of an insulating material covering an outer peripheral surface of the shaping air spurting member is provided on an outer peripheral side of the shaping air spurting member; and a discharge buffering member (16; 41) of an annular insulating material or semi-conductive material is provided in a position where the shield member is separated from the tubular insulating member and the discharge buffering member (16; 41) is located between the shield member and the tubular insulating member, characterized in that a front surface of the discharge buffering member (16; 41) abuts on a rear surface of the shield member, a front surface (15C1) of the tubular insulating member abuts on a rear surface of the discharge buffering member (16; 41), and a front surface of the shield member is flush with a front surface of the shaping air spurting member, and the discharge buffering member (16; 41) is formed as an annular plate body facing a rear surface part of the shield member.