Abstract: An automatic painting apparatus comprising a spraying booth having ceiling openings through which ventilating air is delivered to the spraying booth in downward laminar flows. The spraying booth houses a portal framework including a pair of vertical frames disposed on both sides of a conveying track of articles under a spraying treatment, and a cross frame extending between the vertical frames over and across the article conveying track. The cross frame carries spray guns for spraying paint downwardly. A spray gun moving mechanism connects the cross frame to the vertical frames to be dispaceable longitudinally of the cross frame. One of the vertical frames includes a cross frame drive mechanism for reciprocating the cross frame longitudinally thereof.