A printed circuit board production apparatus comprising: a first printing unit; a second printing unit disposed adjacent to the first printing unit so that a working space of the first printing unit and a working space of the second printing unit fluidically communicate with each other; and a control section for controlling an operation of the first printing unit, wherein: the first printing unit includes a board conveying section for conveying a board, and a printing mechanism section disposed above the board conveying section for subjecting the board conveyed by the board conveying section to a given printing process, the board conveying section includes a conveying-section cover, which covers one side of the board conveying-section facing the second printing unit, the printing mechanism section includes a mechanical-section cover which covers one side of the printing mechanism section facing the second printing unit, and a displaceable segment configured to be displaceable vertically and horizontally, the board conveying section and the displaceable segment being configured to be relatively displaceable between a machine-setup position and a position where a gap defined between the displaceable segment and the conveying-section cover becomes greater than a given value, wherein, in the machine-setup position, one side of the first printing unit facing the second printing unit is covered by the mechanical-section cover, the displacement segment and the conveying-section cover, wherein the machine-setup position is reached by causing the displaceable segment to approach the conveying-section cover and by reducing the gap to a distance equal to or less than the given value; and the control section is operable, when machine setup for the first printing unit is performed during operation of the second printing unit, to displace the board conveying section and the displaceable segment to allow the board conveying section and the displaceable segment to be arranged in the machine-setup position. a first printing unit; a second printing unit disposed adjacent to the first printing unit so that a working space of the first printing unit and a working space of the second printing unit fluidically communicate with each other; and a control section for controlling an operation of the first printing unit, wherein: the first printing unit includes a board conveying section for conveying a board, and a printing mechanism section disposed above the board conveying section for subjecting the board conveyed by the board conveying section to a given printing process, the board conveying section includes a conveying-section cover, which covers one side of the board conveying-section facing the second printing unit, the printing mechanism section includes a mechanical-section cover which covers one side of the printing mechanism section facing the second printing unit, and a displaceable segment configured to be displaceable vertically and horizontally, the board conveying section and the displaceable segment being configured to be relatively displaceable between a machine-setup position and a position where a gap defined between the displaceable segment and the conveying-section cover becomes greater than a given value, wherein, in the machine-setup position, one side of the first printing unit facing the second printing unit is covered by the mechanical-section cover, the displacement segment and the conveying-section cover, wherein the machine-setup position is reached by causing the displaceable segment to approach the conveying-section cover and by reducing the gap to a distance equal to or less than the given value; and the control section is operable, when machine setup for the first printing unit is performed during operation of the second printing unit, to displace the board conveying section and the displaceable segment to allow the board conveying section and the displaceable segment to be arranged in the machine-setup position. the first printing unit includes a board conveying section for conveying a board, and a printing mechanism section disposed above the board conveying section for subjecting the board conveyed by the board conveying section to a given printing process, the board conveying section includes a conveying-section cover, which covers one side of the board conveying-section facing the second printing unit, the printing mechanism section includes a mechanical-section cover which covers one side of the printing mechanism section facing the second printing unit, and a displaceable segment configured to be displaceable vertically and horizontally, the board conveying section and the displaceable segment being configured to be relatively displaceable between a machine-setup position and a position where a gap defined between the displaceable segment and the conveying-section cover becomes greater than a given value, wherein, in the machine-setup position, one side of the first printing unit facing the second printing unit is covered by the mechanical-section cover, the displacement segment and the conveying-section cover, wherein the machine-setup position is reached by causing the displaceable segment to approach the conveying-section cover and by reducing the gap to a distance equal to or less than the given value; and the control section is operable, when machine setup for the first printing unit is performed during operation of the second printing unit, to displace the board conveying section and the displaceable segment to allow the board conveying section and the displaceable segment to be arranged in the machine-setup position.