Disclosed is a screen printing device that has low redundancy, is low cost, and is compact, while maintaining high production efficiency, and that is able to be adapted to a dual-transport component mounting device. The present invention is provided with: a pair of substrate holding tables (10A, 10B) that are provided in order to hold substrates (W) that are to be printed, and are disposed in parallel along the y-axis direction perpendicular to the direction of transport of the substrates (W); and a printing execution unit (20) that executes a printing step alternatingly to the substrates (W) supported at the pair of substrate supporting tables (10A, 10B). A printing position (SP) at which both substrate supporting tables (10A, 10B) perform alternating printing is altered within the range at which one of the substrate supporting tables (10A (10B)) and the other substrate supporting table (10B (10A)) face each other by means of the printing execution unit (20) being driven along the y-axis direction by means of the control by a control unit (60).