Abstract: An electrostatic coating apparatus for flat-plate type objects to be coated, comprising a conveyor carrying flat-plate type objects to be coated and having two parallel and linear portions which carry said objects in opposite directions and which are each L in length and are spaced 2R apart, said L and R having the relationship L.gtoreq.2R; a reversing device which receives coated objects carried from one linear portion and which reverses said objects before feeding them to the other linear portion; a rotary spray head of which the axis of rotation is centrally situated between said linear portions of the conveyor and extends in a vertical direction; and a supporting device which subjects the rotary spray head to reciprocation along said axis of rotation.