An electrostatic coating device including: an arm portion having base end side mounted to an operating device; a head portion provided at a tip side of the arm portion; an air motor provided at the head portion and powered by compressed air, a hollow rotating shaft rotatably supported by the air motor and having a tip protrudes forward from the air motor; a feed tube extending through an inside of the rotating shaft to the tip of the rotating shaft for supplying paint; a rotary atomizing head mounted at the tip of the rotating shaft and configured to spray the paint supplied from the feed tube to a coated object; a valve device provided at the head portion and provided with a switching valve including a trigger valve for opening and closing a paint supply path to the feed tube by pilot air; a high voltage generator provided at the arm portion and configured to apply a high voltage to the paint supplied to the rotary atomizing head through the valve device, the air motor and the rotating shaft; and a cover portion formed as a resin cylindrical body covering an outer peripheral side of the head portion, the electrostatic coating device being characterized in that: a cylindrical gap is provided between the head portion and the cover portion, the cylindrical gap surrounding the outer peripheral side of the head portion, the head portion is provided with a pilot air introduction path guiding the pilot air exhausted from the switching valve to the cylindrical gap, the arm portion is provided with a pilot air exhaust path exhausting the pilot air from the cylindrical gap to the outside. an arm portion having base end side mounted to an operating device; a head portion provided at a tip side of the arm portion; an air motor provided at the head portion and powered by compressed air, a hollow rotating shaft rotatably supported by the air motor and having a tip protrudes forward from the air motor; a feed tube extending through an inside of the rotating shaft to the tip of the rotating shaft for supplying paint; a rotary atomizing head mounted at the tip of the rotating shaft and configured to spray the paint supplied from the feed tube to a coated object; a valve device provided at the head portion and provided with a switching valve including a trigger valve for opening and closing a paint supply path to the feed tube by pilot air; a high voltage generator provided at the arm portion and configured to apply a high voltage to the paint supplied to the rotary atomizing head through the valve device, the air motor and the rotating shaft; and a cover portion formed as a resin cylindrical body covering an outer peripheral side of the head portion, the electrostatic coating device being characterized in that: a cylindrical gap is provided between the head portion and the cover portion, the cylindrical gap surrounding the outer peripheral side of the head portion, the head portion is provided with a pilot air introduction path guiding the pilot air exhausted from the switching valve to the cylindrical gap, the arm portion is provided with a pilot air exhaust path exhausting the pilot air from the cylindrical gap to the outside. a cylindrical gap is provided between the head portion and the cover portion, the cylindrical gap surrounding the outer peripheral side of the head portion, the head portion is provided with a pilot air introduction path guiding the pilot air exhausted from the switching valve to the cylindrical gap, the arm portion is provided with a pilot air exhaust path exhausting the pilot air from the cylindrical gap to the outside.