A screen printing machine comprising: a pair of substrate supporting tables (10A, 10B) including one substrate supporting table and a counterpart substrate supporting table, each of the pair of substrate supporting tables (10A, 10B) being provided for holding a substrate that is a print object, the substrate supporting tables (10A, 10B) being juxtaposed along a specific direction, the specific direction being perpendicular to a conveying direction of the substrate; a printing executing section that performs a printing process, at a print position set in a common area in which both of the substrate supporting tables (10A, 10B) are movable in the specific direction, and on the substrate held by each of the substrate supporting tables (10A, 10B); a substrate supporting table driving mechanism (4A, 4B, 5A, 5B) configured to individually drive the pair of substrate supporting tables (10A, 10B) in the specific direction; and control means for controlling the substrate supporting table driving mechanism (4A, 4B, 5A, 5B) so that the one substrate supporting table that moves into a printing process enters the print position by moving in a direction approaching the counterpart substrate supporting table along the specific direction during movement of the counterpart substrate supporting table that has completed the printing process at the print position as the counterpart substrate supporting table is exiting the print position by moving in a direction receding along the specific direction, wherein: the control means controls the substrate supporting table driving mechanism (4A, 4B, 5A, 5B) so that the one substrate supporting table completes entry to the print position after the counterpart substrate supporting table completes exiting from the print position, in a way that an exit period for the counterpart substrate supporting table exiting the print position and an entry period for the one substrate supporting table entering the print position at least partially overlap each other, characterized in that the control means includes: interference avoidance necessity judging means for judging whether or not it is necessary to avoid interference between the substrate supporting table entering the print position, and the substrate supporting table exiting the print position; and regulating means for regulating interference between the two substrate supporting tables (10A, 10B) when the interference avoidance necessity judging means judges that interference avoidance is necessary. a pair of substrate supporting tables (10A, 10B) including one substrate supporting table and a counterpart substrate supporting table, each of the pair of substrate supporting tables (10A, 10B) being provided for holding a substrate that is a print object, the substrate supporting tables (10A, 10B) being juxtaposed along a specific direction, the specific direction being perpendicular to a conveying direction of the substrate; a printing executing section that performs a printing process, at a print position set in a common area in which both of the substrate supporting tables (10A, 10B) are movable in the specific direction, and on the substrate held by each of the substrate supporting tables (10A, 10B); a substrate supporting table driving mechanism (4A, 4B, 5A, 5B) configured to individually drive the pair of substrate supporting tables (10A, 10B) in the specific direction; and control means for controlling the substrate supporting table driving mechanism (4A, 4B, 5A, 5B) so that the one substrate supporting table that moves into a printing process enters the print position by moving in a direction approaching the counterpart substrate supporting table along the specific direction during movement of the counterpart substrate supporting table that has completed the printing process at the print position as the counterpart substrate supporting table is exiting the print position by moving in a direction receding along the specific direction, the control means controls the substrate supporting table driving mechanism (4A, 4B, 5A, 5B) so that the one substrate supporting table completes entry to the print position after the counterpart substrate supporting table completes exiting from the print position, in a way that an exit period for the counterpart substrate supporting table exiting the print position and an entry period for the one substrate supporting table entering the print position at least partially overlap each other, interference avoidance necessity judging means for judging whether or not it is necessary to avoid interference between the substrate supporting table entering the print position, and the substrate supporting table exiting the print position; and regulating means for regulating interference between the two substrate supporting tables (10A, 10B) when the interference avoidance necessity judging means judges that interference avoidance is necessary.