A printed circuit board (W) rested on a table (4) and a tool held by a single spindle (13) are moved relatively in directions X, Y and Z to work the board (W). An inverted device (B) rockingly attached to the table (4), receives and delivery the board (W). A conveying device (C) mounted along a bed (1) of the working apparatus (A) is provided with a supply course (C1) and a discharge course (C2) for conveying the board (W) in an inclined state. A lifting device (D) is provided at a receiving-delivering position of the respective courses of this conveying device (C) on the side of the working apparatus, for receiving and delivering the board between the inverted device (B) and the respective courses. A printed circuit board supply device (E) is connected to one end of the supply course (C1) and a printed circuit board recovery device (F) is connected to one end of the discharge course (C2). A detector (G) attached to the spindle (13) of the working apparatus (A), reads the types of boards (W) supplied onto the table (4).
