A screen printing apparatus that receives a substrate conveyed along a predetermined conveying direction from a substrate entry position (EnP1, EnP2), screen prints on the substrate, and delivers the substrate after the printing from a substrate exit position (ExP1, ExP2) that is set on a downstream side in the conveying direction, said screen printing apparatus comprising: at least one printing execution unit (20A, 20B) that includes a screen mask, the printing execution unit (20A, 20B) performing screen printing on the substrate and setting a printing position (SP1, SP2); at least one substrate support table (10A, 10B), movable guided by a rail along a specific direction orthogonal to the conveying direction, the substrate support table (10A, 10B) being provided with a clamp unit for holding the substrate conveyed from the substrate entry position (EnP1, EnP2) to execute print-process at the printing position (SP1, SP2) that is set by the printing execution unit (20A, 20B), and belt conveyor pairs (12A, 12B) for delivering the substrate after printing from the substrate exit position (ExP1, ExP2); and a table drive mechanism (4A, 5A, 4B, 5B) that moves the substrate support table (10A, 10B) at least from the substrate entry position (EnP1, EnP2) to the substrate exit position (ExP1, ExP2) along the specific direction in a reciprocating manner, wherein the substrate entry and exit positions (EnP1, EnP2, ExP1, ExP2) are set asymmetrically with respect to an apparatus center axis along the specific direction, characterised in that said screen printing apparatus further comprises: a printing execution unit drive mechanism that drives the printing execution unit (20A, 20B) along the specific direction; and control means for controlling the printing execution unit drive mechanism so that the printing execution unit (20A, 20B) including the screen mask is driven, as necessary, in order to adjust the printing position (SP1, SP2) on a substrate conveying path (PH1, PH2) needed for the substrate support table (10A, 10B) to move from the substrate entry to the substrate exit. at least one printing execution unit (20A, 20B) that includes a screen mask, the printing execution unit (20A, 20B) performing screen printing on the substrate and setting a printing position (SP1, SP2); at least one substrate support table (10A, 10B), movable guided by a rail along a specific direction orthogonal to the conveying direction, the substrate support table (10A, 10B) being provided with a clamp unit for holding the substrate conveyed from the substrate entry position (EnP1, EnP2) to execute print-process at the printing position (SP1, SP2) that is set by the printing execution unit (20A, 20B), and belt conveyor pairs (12A, 12B) for delivering the substrate after printing from the substrate exit position (ExP1, ExP2); and a table drive mechanism (4A, 5A, 4B, 5B) that moves the substrate support table (10A, 10B) at least from the substrate entry position (EnP1, EnP2) to the substrate exit position (ExP1, ExP2) along the specific direction in a reciprocating manner, wherein the substrate entry and exit positions (EnP1, EnP2, ExP1, ExP2) are set asymmetrically with respect to an apparatus center axis along the specific direction, characterised in that said screen printing apparatus further comprises: a printing execution unit drive mechanism that drives the printing execution unit (20A, 20B) along the specific direction; and control means for controlling the printing execution unit drive mechanism so that the printing execution unit (20A, 20B) including the screen mask is driven, as necessary, in order to adjust the printing position (SP1, SP2) on a substrate conveying path (PH1, PH2) needed for the substrate support table (10A, 10B) to move from the substrate entry to the substrate exit. a printing execution unit drive mechanism that drives the printing execution unit (20A, 20B) along the specific direction; and control means for controlling the printing execution unit drive mechanism so that the printing execution unit (20A, 20B) including the screen mask is driven, as necessary, in order to adjust the printing position (SP1, SP2) on a substrate conveying path (PH1, PH2) needed for the substrate support table (10A, 10B) to move from the substrate entry to the substrate exit.